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Accounting Policies (Details 2) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Nov. 15, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Nov. 30, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Nov. 30, 2011
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Dec. 31, 2011
Adjustment
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
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Dec. 31, 2010
Adjustment
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
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| Accounting Policies | ||||||||||||||||
| Decrease in net income on adoption of FASB guidance | $ (86,267,000) | $ (111,882,000) | $ (74,025,000) | $ (90,626,000) | $ (192,948,000) | $ (102,885,000) | $ (19,676,000) | $ (48,984,000) | $ (362,800,000) | $ (364,493,000) | $ (246,167,000) | $ (4,000,000) | $ (4,200,000) | |||
| Decrease in net income per diluted share on adoption of FASB guidance (in dollars per share) | $ (0.29) | $ (0.38) | $ (0.25) | $ (0.31) | $ (0.66) | $ (0.35) | $ (0.11) | $ (0.30) | $ (1.23) | $ (1.58) | $ (1.56) | $ (0.02) | $ (0.03) | |||
| Principal amount repaid | $ 230,000,000 | $ 230,000,000 | ||||||||||||||
| Aggregate shares of common stock issued for the conversion value in excess of the principal amount | 943,714 | 943,714 | 943,714 | |||||||||||||