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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes |  |  |  |  |  |  |  |  |  |  |
Minimum adjusted taxable income to be distributed to shareholders to qualify as a REIT (as a percent) |  |  |  |  |  |  |  |  | 90.00% |  |
Subsequent period during which entity would be disqualified as a REIT if during any tax year entity fails to qualify as a REIT (in years) |  |  |  |  |  |  |  |  | 4 |  |
Net (loss) income | $ (87,215) | $ 7,470 | $ (26,007) | $ (18,566) | $ 16,752 | $ 8,926 | $ 9,151 | $ 10,675 | $ (124,318) | $ 45,504 | $ 61,299
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Rental revenue recognition |  |  |  |  |  |  |  |  | (10,708) | (9,192) | (1,646)
Compensation expense recognition |  |  |  |  |  |  |  |  | (1,298) | (4,820) | (5,240)
Operating expense recognition |  |  |  |  |  |  |  |  | 751 | 280 | 1,061
Gain on sales of properties |  |  |  |  |  |  |  |  | 1,154 | 6,548 |
Impairment losses | (78,674) |  | (44,605) | (27,742) |  |  |  |  | (151,021) |  |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  | (29,805) |  |
Gains from non-real estate investments |  |  |  |  |  |  |  |  | 4,447 | (6,994) | (1,029)
Income from service operations |  |  |  |  |  |  |  |  | (16,047) | (1,628) | 303
Income tax expense |  |  |  |  |  |  |  |  | 10,679 | 119 | 196
Depreciation and amortization |  |  |  |  |  |  |  |  | 44,070 | 42,365 | 36,031
Discounts/premiums included in interest expense |  |  |  |  |  |  |  |  | 5,540 | 5,841 | 3,412
Income from unconsolidated entities |  |  |  |  |  |  |  |  | (374) | (244) | (12)
Noncontrolling interests, gross |  |  |  |  |  |  |  |  | (4,891) | (3,288) | (5,813)
Other |  |  |  |  |  |  |  |  | 88 | 2,173 | (1,947)
Taxable income |  |  |  |  |  |  |  |  | $ 89,919 | $ 76,664 | $ 86,615

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