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Income Taxes (Reconciliation of Net Income To REIT Taxable Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 59,961 |  | $ 31,142 |  | $ (44,203)
Less (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (3,582) |  | (926) |  | 403
Less income allocated to perpetual preferred units |  |  |  |  |  |  |  |  | (7,000) |  | (7,000) |  | (7,000)
Net income (loss) attributable to common shareholders | 46,850 | 11,840 | (16,597) | 7,286 | 17,147 | 1,650 | 2,134 | 2,285 | 49,379 | [1] | 23,216 | [1] | (50,800)
Loss of taxable REIT subsidiaries included above |  |  |  |  |  |  |  |  | 539 |  | 2,056 |  | 25,124
Net income (loss) from REIT operations |  |  |  |  |  |  |  |  | 49,918 |  | 25,272 |  | (25,676)
Book depreciation and amortization, including discontinued operations |  |  |  |  |  |  |  |  | 188,042 |  | 179,662 |  | 178,607
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (155,636) |  | (158,134) |  | (164,639)
Book/tax difference on gains/losses from capital transactions |  |  |  |  |  |  |  |  | (4,315) |  | 37,798 |  | (7,059)
Book/tax difference on impairment associated with land development activities |  |  |  |  |  |  |  |  |  |  |  |  | 62,397
Other book/tax differences, net |  |  |  |  |  |  |  |  | 8,205 |  | (10,565) |  | (24,188)
REIT taxable income |  |  |  |  |  |  |  |  | 86,214 |  | 74,033 |  | 19,442
Dividends paid deduction |  |  |  |  |  |  |  |  | (143,657) |  | (124,999) |  | (128,507)
Dividends paid in excess of taxable income |  |  |  |  |  |  |  |  | $ (57,443) |  | $ (50,966) |  | $ (109,065)
[1] | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

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