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Selected Quarterly Financial Data (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Quarterly Financial Data [Abstract]                      
Revenues                 $ 140,583,000 $ 134,828,000 $ 130,998,000
Revenues as previously reported 35,813,000 33,579,000 36,990,000 34,477,000 34,334,000.00 33,418,000.00 32,578,000.00 34,510,000.00      
Revenues from discontinued operations and reclassifications   (91,000) [1] (92,000) [1] (93,000) [1] (151,000.00) [1] 68,000.00 [1] 46,000.00 [1] 25,000.00 [1]      
Revenues 35,813,000.00 33,488,000.00 36,898,000.00 34,384,000.00 34,183,000.00 33,486,000.00 32,624,000.00 34,535,000.00      
Net (loss) income 30,690,000.00 2,298,000.00 5,895,000.00 (4,868,000.00) (3,427,000.00) (71,265,000.00) (24,729,000.00) (9,093,000.00) (375,000) (920,000)  
Net (loss) income attributable to common shareholders $ 22,292,000.00 $ (4,299,000.00) $ 1,236,000.00 $ (9,340,000.00) $ (7,679,000.00) $ (70,105,000.00) $ (27,668,000.00) $ (12,309,000.00) $ 9,889,000 $ (117,761,000) $ (51,485,000)
Per common share attributable to common shareholders (basic and diluted) $ 0.31 [2] $ (0.07) [2] $ 0.01 [2] $ (0.14) [2] $ (0.12) [2] $ (1.05) [2] $ (0.41) [2] $ (0.18) [2] $ 0.13 $ (1.79) $ (0.81)
[1] Represents revenues from discontinued operations which were included in revenues as previously reported.
[2] Differences between the sum of the four quarterly per share amounts and the annual per share amounts are attributable to the effect of the weighted average outstanding share calculations for the respective periods.