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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
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.