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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Less: Undistributed earnings attributable to unvested restricted shares $ (1) $ 0 $ (8) $ (136)
Numerator:        
Net income attributable to common shareholders 41,174 40,594 124,918 144,435
Less: Dividends paid on unvested restricted shares (204) (346) (891) (863)
Less: Undistributed earnings attributable to unvested restricted shares (1) 0 (8) (136)
Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 40,969 $ 40,248 $ 124,019 $ 143,436
Denominator:        
Weighted-average number of common shares - basic (in shares) 123,621,323 127,663,480 123,635,010 129,855,686
Unvested restricted shares (in shares) 194,210 479,674 224,743 554,927
Unvested performance units (in shares) 20,919 0 0 0
Weighted-average number of common shares - diluted (in shares) 123,836,452 128,143,154 123,859,753 130,410,613
Net income per share attributable to common shareholders - basic (in dollars per share) $ 0.33 $ 0.32 $ 1.00 $ 1.10
Net income per share attributable to common shareholders - diluted (in dollars per share) $ 0.33 $ 0.31 $ 1.00 $ 1.10