Senior Notes Payable and Other Debt (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011
Principal Amount Due at Maturity [Member] | Nov. 02, 2011
Unsecured Revolving Credit Facilities [Member] | Sep. 30, 2011
Unsecured Revolving Credit Facilities [Member] | Sep. 30, 2011
Scheduled Periodic Amortization [Member] | Sep. 30, 2011
3 7/8 % Convertible Senior Notes due 2011 [Member] | Dec. 31, 2010
3 7/8 % Convertible Senior Notes due 2011 [Member] | Sep. 30, 2011
9% Senior Notes due 2012 [Member] | Dec. 31, 2010
9% Senior Notes due 2012 [Member] | Sep. 30, 2011
3.125% Senior Notes due 2015 [Member] | Dec. 31, 2010
3.125% Senior Notes due 2015 [Member] | Sep. 30, 2011
8 1/4% Senior Notes due 2012 [Member] | Sep. 30, 2011
Unsecured term loan due 2012 [Member] | Sep. 30, 2011
Unsecured term loan due 2013 [Member] | Dec. 31, 2010
Unsecured term loan due 2013 [Member] | Sep. 30, 2011
6.25% Senior Notes due 2013 [Member] | Sep. 30, 2011
6% Senior Notes due 2015 [Member] | Sep. 30, 2011
6.90% Senior Notes due 2037 [Member] | Sep. 30, 2011
6.59% Senior Notes due 2038 [Member] | Sep. 30, 2011
6 1/2% Senior Notes due 2016 [Member] | Dec. 31, 2010
6 1/2% Senior Notes due 2016 [Member] | Sep. 30, 2011
6 3/4% Senior Notes due 2017 [Member] | Dec. 31, 2010
6 3/4% Senior Notes due 2017 [Member] | Sep. 30, 2011
4.750% Senior Notes due 2021 [Member] | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Long-term debt and certain interest rate and maturity information | ||||||||||||||||||||||||||||
| Line of credit | $ 474,000,000 | $ 40,000 | ||||||||||||||||||||||||||
| Senior Notes | 230,000 | 230,000 | 82,433 | 82,433 | 400,000 | 400,000 | 72,950 | 269,850 | 234,420 | 52,400 | 22,973 | 200,000 | 400,000 | 225,000 | 225,000 | 700,000 | ||||||||||||
| Unsecured term loan due | 727,000 | 250,000 | 200,000 | 200,000 | ||||||||||||||||||||||||
| Mortgage loans and other | 2,651,830 | 1,349,521 | ||||||||||||||||||||||||||
| Total | 6,065,856 | 2,926,954 | 5,217,370 | 474,000 | [1] | 374,486 | ||||||||||||||||||||||
| Capital lease obligations | 143,119 | |||||||||||||||||||||||||||
| Unamortized fair value adjustment | 145,647 | 11,790 | ||||||||||||||||||||||||||
| Unamortized commission fees and discounts | (41,481) | (38,700) | ||||||||||||||||||||||||||
| Senior notes payable and other debt | $ 6,313,141 | $ 2,900,044 | ||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||