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Share-Based Compensation Stock and Non-Vested Stock (Details) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||
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Feb. 25, 2009
Phantom Stock [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2012
Phantom Stock [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2011
Phantom Stock [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2010
Phantom Stock [Member]
2003 Stock Incentive Plan [Member]
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Feb. 25, 2009
Phantom Stock [Member]
Three-year graded vesting period [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2012
Restricted Stock [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2011
Restricted Stock [Member]
2003 Stock Incentive Plan [Member]
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Dec. 31, 2010
Restricted Stock [Member]
2003 Stock Incentive Plan [Member]
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Jun. 30, 2010
Restricted Stock [Member]
2007 Retention Grants [Member]
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Dec. 01, 2009
Restricted Stock [Member]
2007 Retention Grants [Member]
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Dec. 01, 2008
Restricted Stock [Member]
2007 Retention Grants [Member]
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Jun. 30, 2011
Restricted Stock [Member]
2011 Restricted Stock Awards [Member]
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Dec. 31, 2012
Restricted Stock [Member]
One Year Graded Vesting Period [Member]
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Dec. 31, 2012
Restricted Stock [Member]
Vesting Period June 30, 2012 [Member]
2011 Restricted Stock Awards [Member]
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Dec. 31, 2012
Restricted Stock [Member]
Vesting Period June 30, 2013 [Member]
2011 Restricted Stock Awards [Member]
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Dec. 31, 2012
Restricted Stock [Member]
Three-year graded vesting period [Member]
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Dec. 31, 2012
Restricted Stock [Member]
Four-year graded vesting period [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0 | 5,262,000 | 502,000 | 10,293,000 | 2,565,000 | 1,234,000 | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | 1 year | 3 years | 4 years | |||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage | 20.00% | 30.00% | 50.00% | 33.00% | 33.00% | 33.00% | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | |||||||||||||||||
| Non-vested shares at January 2012 | 1,879,000 | ||||||||||||||||
| Weighted Average Grant Date Fair Value at January 1, 2012 | $ 7.75 | ||||||||||||||||
| Non-vested shares, granted | 5,545,000 | 10,293,000 | |||||||||||||||
| Weighted Average Grant Date Fair Value, granted | $ 14.06 | $ 7.72 | $ 3.31 | ||||||||||||||
| Non-vested shares, vested | (4,361,000) | ||||||||||||||||
| Weighted Average Grant Date Fair Value, forfeited | $ 12.76 | $ 7.26 | $ 5.54 | ||||||||||||||
| Non-vested shares, forfeited | 14,000 | ||||||||||||||||
| Weighted Average Grant Date Fair Value, forfeited | $ 12.78 | ||||||||||||||||
| Non-vested at December 31, 2012 | 7,797,000 | 1,879,000 | |||||||||||||||
| Weighted Average Grant Date Fair Value at December 31, 2012 | $ 13.27 | $ 7.75 | |||||||||||||||