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Debt and Debt-Related Parties Convertible Senior Unsecured Notes (Details) (USD $)
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3 Months Ended | 12 Months Ended | ||||||||||
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Jun. 30, 2009
Convertible Senior Unsecured Notes [Member]
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Dec. 31, 2011
Convertible Senior Unsecured Notes [Member]
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Sep. 30, 2011
Convertible Senior Unsecured Notes [Member]
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Aug. 01, 2011
Convertible Senior Unsecured Notes [Member]
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Jul. 31, 2005
Convertible Senior Unsecured Notes [Member]
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Dec. 31, 2011
Convertible Senior Unsecured Notes [Member]
Maximum [Member]
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Dec. 31, 2011
Convertible Senior Unsecured Notes [Member]
Current Debt Discount [Member]
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Dec. 31, 2010
Convertible Senior Unsecured Notes [Member]
Current Debt Discount [Member]
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Dec. 31, 2011
Parent [Member]
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Dec. 31, 2010
Parent [Member]
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Dec. 31, 2011
Parent [Member]
Convertible Senior Unsecured Notes [Member]
Current Debt Discount [Member]
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Dec. 31, 2010
Parent [Member]
Convertible Senior Unsecured Notes [Member]
Current Debt Discount [Member]
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| Debt Instrument [Line Items] | ||||||||||||
| Debt Instrument, Face Amount | $ 204,600,000 | $ 325,000,000 | ||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 2.25% | |||||||||||
| Debt Instrument, Convertible, Conversion Rate, (in shares) per $1,000 principal amount | 28.2326 | |||||||||||
| Debt Instrument, Convertible, Conversion Price | $ 35.42 | |||||||||||
| Redemption of Debt Instrument, Percentage | 100.00% | |||||||||||
| Debt Instrument, Trading Period | 10 days | |||||||||||
| Volume- Weighted Average Price of Common Stock | $ 53.13 | |||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 0.50% | |||||||||||
| Debt Conversion, Original Debt, Amount | 120,400,000 | |||||||||||
| Debt Conversion, Converted Instrument, Amount | 30,000,000 | |||||||||||
| Debt Conversion, Converted Instrument, Shares Issued | 4,000,000 | |||||||||||
| Debt Instrument, Convertible, Number of Equity Instruments, in shares | 5,800,000 | |||||||||||
| Long-term Debt, Current Maturities | 190,700,000 | 194,724,000 | 0 | |||||||||
| Duration of Convertible Senior Unsecured Notes | 12 months | |||||||||||
| Convertible Debt, Fair Value Disclosures | 134,000,000 | |||||||||||
| Debt Instrument, Unamortized Discount | $ 9,906,000 | $ 0 | $ (9,906,000) | $ 0 | ||||||||
| X | ||||||||||
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- Definition
Debt Instrument, Convertible, Conversion Rate No definition available.
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| X | ||||||||||
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- Definition
Debt Instrument, Convertible, Number of Equity Instruments, in shares No definition available.
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| X | ||||||||||
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- Definition
Debt Instrument, Trading Period No definition available.
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| X | ||||||||||
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- Definition
duration of Convertible Senior Unsecured Notes No definition available.
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| X | ||||||||||
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- Definition
Redemption of Debt Instrument, Percentage No definition available.
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| X | ||||||||||
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- Definition
Volume- Weighted Average Price of Common Stock No definition available.
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| X | ||||||||||
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- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Fair value of convertible debt at the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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| X | ||||||||||
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- Definition
The price per share of the conversion feature embedded in the debt instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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