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Borrowing Arrangements (Details) (USD $)
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Dec. 31, 2011
property
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Dec. 31, 2010
property
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Dec. 31, 2011
Unsecured revolving credit facilities
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Dec. 31, 2010
Unsecured revolving credit facilities
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Dec. 31, 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. 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, 2011
9% Senior Notes due 2012
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Dec. 31, 2010
9% Senior Notes due 2012
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Dec. 31, 2009
9% Senior Notes due 2012
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Dec. 31, 2011
8 1/4% Senior Notes due 2012
|
Dec. 31, 2010
8 1/4% Senior Notes due 2012
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Dec. 31, 2011
Unsecured term loan due 2013
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Dec. 31, 2010
Unsecured term loan due 2013
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Dec. 31, 2011
6.25% Senior Notes due 2013
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Dec. 31, 2010
6.25% Senior Notes due 2013
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Dec. 31, 2011
Unsecured term loan due 2015
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Dec. 31, 2010
Unsecured term loan due 2015
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Dec. 31, 2011
3.125% Senior Notes due 2015
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Dec. 31, 2010
3.125% Senior Notes due 2015
|
Nov. 30, 2010
3.125% Senior Notes due 2015
|
Dec. 31, 2011
6% Senior Notes due 2015
|
Dec. 31, 2010
6% Senior Notes due 2015
|
Dec. 31, 2011
6 1/2% Senior Notes due 2016
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Jul. 31, 2011
6 1/2% Senior Notes due 2016
|
Dec. 31, 2010
6 1/2% Senior Notes due 2016
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Dec. 31, 2011
Unsecured term loan due 2017
|
Dec. 31, 2010
Unsecured term loan due 2017
|
Dec. 31, 2011
6 3/4% Senior Notes due 2017
|
Dec. 31, 2010
6 3/4% Senior Notes due 2017
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May 31, 2010
6 3/4% Senior Notes due 2017
|
Dec. 31, 2009
6 3/4% Senior Notes due 2017
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Dec. 31, 2011
4.750% Senior Notes due 2021
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May 31, 2011
4.750% Senior Notes due 2021
|
Dec. 31, 2010
4.750% Senior Notes due 2021
|
Dec. 31, 2011
6.90% Senior Notes due 2037
|
Dec. 31, 2010
6.90% Senior Notes due 2037
|
Dec. 31, 2011
6.59% Senior Notes due 2038
|
Dec. 31, 2010
6.59% Senior Notes due 2038
|
Dec. 31, 2011
Mortgage loans and other
|
Dec. 31, 2010
Mortgage loans and other
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt instruments | |||||||||||||||||||||||||||||||||||||||||||
| Total | $ 6,180,443,000 | $ 2,926,954,000 | $ 455,578,000 | $ 40,000,000 | $ 0 | $ 230,000,000 | $ 230,000,000 | $ 82,433,000 | $ 82,433,000 | $ 72,950,000 | $ 0 | $ 200,000,000 | $ 200,000,000 | $ 269,850,000 | $ 0 | $ 126,875,000 | $ 0 | $ 400,000,000 | $ 400,000,000 | $ 234,420,000 | $ 0 | $ 200,000,000 | $ 200,000,000 | $ 400,000,000 | $ 375,000,000 | $ 0 | $ 225,000,000 | $ 225,000,000 | $ 700,000,000 | $ 0 | $ 52,400,000 | $ 0 | $ 22,973,000 | $ 0 | $ 2,762,964,000 | $ 1,349,521,000 | |||||||
| Interest rate (as a percent) | 3.875% | 3.875% | 3.875% | 3.875% | 3.875% | 9.00% | 9.00% | 9.00% | 8.25% | 8.25% | 6.25% | 6.25% | 3.125% | 3.125% | 3.125% | 6.00% | 6.00% | 6.50% | 6.50% | 6.50% | 6.75% | 6.75% | 6.75% | 6.75% | 4.75% | 4.75% | 4.75% | 6.90% | 6.90% | 6.59% | 6.59% | ||||||||||||
| Capital lease obligations | 143,006,000 | 0 | |||||||||||||||||||||||||||||||||||||||||
| Unamortized fair value adjustment | 144,923,000 | 11,790,000 | |||||||||||||||||||||||||||||||||||||||||
| Unamortized commission fees and discounts | (39,256,000) | (38,700,000) | |||||||||||||||||||||||||||||||||||||||||
| Senior notes payable and other debt | 6,429,116,000 | 2,900,044,000 | |||||||||||||||||||||||||||||||||||||||||
| Joint venture partners' share of total debt | 46,600,000 | 4,800,000 | |||||||||||||||||||||||||||||||||||||||||
| Number of properties owned through consolidated joint ventures with mortgage debt | 8 | 3 | |||||||||||||||||||||||||||||||||||||||||
| Debt related to investments in unconsolidated entities | $ 131,500,000 | $ 45,900,000 |