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Accounting Policies (Details 2) (USD $)
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3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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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, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2011
Nonconvertible debt
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Nov. 30, 2011
3 7/8 % Convertible Senior Notes due 2011 upon maturity
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Dec. 31, 2011
3 7/8 % Convertible Senior Notes due 2011 upon maturity
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Nov. 15, 2011
3 7/8 % Convertible Senior Notes due 2011 upon maturity
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Dec. 31, 2010
3 7/8 % Convertible Senior Notes due 2011 upon maturity
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Mar. 31, 2010
3 7/8 % Convertible Senior Notes due 2011 upon maturity
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Dec. 31, 2008
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
Nonconvertible debt
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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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Dec. 31, 2009
Adjustment
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
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Dec. 31, 2008
Adjustment
Adoption of FASB guidance relating to convertible debt instruments that may be settled in cash upon conversion
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| Accounting Policies | |||||||||||||||||||||||
| Borrowing rate (as a percent) | 6.125% | 3.875% | 3.875% | 3.875% | 3.875% | 3.875% | |||||||||||||||||
| Real estate assets for which tenant purchase option is recorded, net | $ 644,000,000 | $ 644,000,000 | |||||||||||||||||||||
| Decrease in net income on adoption of FASB guidance | (192,948,000) | (102,885,000) | (19,676,000) | (48,984,000) | (77,583,000) | (57,898,000) | (58,067,000) | (52,619,000) | (364,493,000) | (246,167,000) | (266,495,000) | 4,000,000 | 4,200,000 | 3,900,000 | |||||||||
| Decrease in net income per diluted share on adoption of FASB guidance (in dollars per share) | $ (0.66) | $ (0.35) | $ (0.11) | $ (0.30) | $ (0.49) | $ (0.37) | $ (0.37) | $ (0.34) | $ (1.58) | $ (1.56) | $ (1.74) | $ 0.02 | $ 0.03 | $ 0.03 | |||||||||
| Increase in total equity on adoption of FASB guidance | 9,355,944,000 | 2,390,205,000 | 9,355,944,000 | 2,390,205,000 | 2,484,060,000 | 2,179,735,000 | 12,100,000 | ||||||||||||||||
| Calculated equity component on adoption of FASB guidance | 19,500,000 | ||||||||||||||||||||||
| Remaining unamortized liability component | 6,429,116,000 | 2,900,044,000 | 6,429,116,000 | 2,900,044,000 | |||||||||||||||||||
| Principal amount repaid | $ 230,000,000 | ||||||||||||||||||||||
| Aggregate shares of common stock issued for the conversion value in excess of the principal amount | 943,714 | ||||||||||||||||||||||