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Quarterly Financial Data (Summarized Quarterly Financial Data) (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 Data [Abstract]                      
Revenues $ 167,712 $ 166,541 $ 162,750 $ 158,865 $ 153,146 $ 152,037 $ 149,049 $ 147,218 $ 655,868 [1] $ 601,450 [1] $ 602,648
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)
Net income (loss) attributable to common shareholders, as adjusted - per share $ 0.63 [2] $ 0.16 $ (0.23) [3] $ 0.10 $ 0.24 [4] $ 0.02 $ 0.03 $ 0.03 $ 0.67 [1] $ 0.33 [1] $ (0.80)
Net income (loss) attributable to common shareholders, as adjusted - per share $ 0.62 [2] $ 0.16 $ (0.23) [3] $ 0.10 $ 0.24 [4] $ 0.02 $ 0.03 $ 0.03 $ 0.66 [1] $ 0.33 [1] $ (0.80)
Loss on discontinuation of hedging relationship                 (29,791)    
Loss on discontinuation of a hedging relationship per share, basic     $ 0.41                
Loss from discontinuation of a hedging relationship per diluted share during the quarter     $ 0.41                
Gain on sale of discontinued operations $ 24,621       $ 9,614       $ 24,621 $ 9,614 $ 16,887
Gain on sale of discontinued operations per share, basic $ 0.33       $ 0.14            
Gain on sale of discontinued operations per share, diluted $ 0.33       $ 0.13            
[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.
[2] Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.
[3] Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.
[4] Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.