Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Unaudited) (Details)

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Selected Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]                      
Real estate rental revenue $ 76,708 [1],[2] $ 71,931 [1],[2] $ 71,684 [1],[2] $ 69,204 [1],[2] $ 65,364 [1],[2] $ 65,032 [1],[2] $ 64,087 [1],[2] $ 64,007 [1],[2] $ 289,527 $ 258,490 $ 256,549
Income (loss) from continuing operations (10,385) [1],[2] 2,707 [1],[2] 4,431 [1],[2] 2,119 [1],[2] (6,963) [1],[2] 3,093 [1],[2] 3,444 [1],[2] 1,418 [1],[2] (1,128) 992 9,723
Net income 31,098 [1],[2] 63,036 [1],[2] 6,556 [1],[2] 4,688 [1],[2] 10,615 [1],[2] 6,658 [1],[2] 15,021 [1],[2] 5,265 [1],[2] 105,378 37,559 40,948
Net income attributable to the controlling interests $ 30,689 [1],[2] $ 63,008 [1],[2] $ 6,522 [1],[2] $ 4,665 [1],[2] $ 10,591 [1],[2] $ 6,625 [1],[2] $ 14,994 [1],[2] $ 5,216 [1],[2] $ 104,884 $ 37,426 $ 40,745
Earnings per common share, basic, Continuing operations $ (0.16) [1],[2] $ 0.04 [1],[2] $ 0.07 [1],[2] $ 0.03 [1],[2] $ (0.11) [1],[2] $ 0.05 [1],[2] $ 0.05 [1],[2] $ 0.02 [1],[2] $ (0.02) $ 0.02 $ 0.17
Earnings per common share, diluted, Continuing operations $ (0.16) [1],[2] $ 0.04 [1],[2] $ 0.07 [1],[2] $ 0.03 [1],[2] $ (0.11) [1],[2] $ 0.04 [1],[2] $ 0.05 [1],[2] $ 0.02 [1],[2] $ (0.02) $ 0.02 $ 0.17
Net income per share, Basic $ 0.46 [1],[2] $ 0.95 [1],[2] $ 0.10 [1],[2] $ 0.07 [1],[2] $ 0.16 [1],[2] $ 0.11 [1],[2] $ 0.24 [1],[2] $ 0.09 [1],[2] $ 1.58 $ 0.60 $ 0.71
Net income per share, Diluted $ 0.46 [1],[2] $ 0.95 [1],[2] $ 0.10 [1],[2] $ 0.07 [1],[2] $ 0.16 [1],[2] $ 0.10 [1],[2] $ 0.24 [1],[2] $ 0.09 [1],[2] $ 1.58 $ 0.60 $ 0.71
[1] With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.
[2] The prior quarter results have been restated to conform to the current quarter presentation. Specifically, results related to properties sold or held for sale have been reclassified into discontinued operations.