| 
           Financial Instruments Fair Value, by Balance Sheet Grouping (Details) (USD $) 
        In Thousands, except Per Share data, unless otherwise specified  | 
        
           Dec. 31, 2011
 
          Senior Notes [Member]
 
          2013 Senior Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2010
 
          Senior Notes [Member]
 
          2013 Senior Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2011
 
          Senior Notes [Member]
 
          2013 Senior Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Senior Notes [Member]
 
          2013 Senior Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2011
 
          Senior Notes [Member]
 
          2016 Senior Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2010
 
          Senior Notes [Member]
 
          2016 Senior Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2011
 
          Senior Notes [Member]
 
          2016 Senior Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Senior Notes [Member]
 
          2016 Senior Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Jul. 31, 2005
 
          Convertible Senior Unsecured Notes [Member] 
         | 
        
           Dec. 31, 2011
 
          Convertible Senior Unsecured Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2010
 
          Convertible Senior Unsecured Notes [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2011
 
          Convertible Senior Unsecured Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Convertible Senior Unsecured Notes [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2011
 
          Loans Payable [Member]
 
          2007 Term Loan
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2010
 
          Loans Payable [Member]
 
          2007 Term Loan
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2011
 
          Loans Payable [Member]
 
          2007 Term Loan
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Loans Payable [Member]
 
          2007 Term Loan
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member] 
         | 
        
           Dec. 31, 2011
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2010
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member]
 
          Carrying Amount [Member] 
         | 
        
           Dec. 31, 2011
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2010
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member]
 
          Estimated Fair Value [Member] 
         | 
        
           Dec. 31, 2011
 
          Investor [Member]
 
          Convertible Loans Payable [Member]
 
          2008 Loans [Member] 
         | 
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt, Long-term and Related Party, Combined Amount, Fair Value | $ 550,000 | [1] | $ 550,000 | [1] | $ 555,500 | [1] | $ 541,750 | [1] | $ 1,642,418 | [1] | $ 1,637,723 | [1] | $ 1,650,630 | [1] | $ 1,523,082 | [1] | $ 194,724 | [2] | $ 179,129 | [2] | $ 186,740 | [2] | $ 131,660 | [2] | $ 298,000 | [3] | $ 298,000 | [3] | $ 292,728 | [3] | $ 297,464 | [3] | $ 282,293 | [4] | $ 262,657 | [4] | $ 282,293 | [4] | $ 262,657 | [4] | |||||||||||
| Percentage of lenders | 96.60% | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Conversion price | $ 35.42 | $ 5.00 | |||||||||||||||||||||||||||||||||||||||||||||||||
          
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