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Earnings Per Share - Reconciliation of Amounts Used in Calculating Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income                 $ 31,483 $ 32,966 $ 66,873
Dividends paid on unvested shares and LTIP units                 (189) (151) (216)
Undistributed earnings allocated to unvested shares and LTIP units                 0 0 (324)
Net income attributable to common shareholders $ 2,660 $ 13,355 $ 12,168 $ 3,300 $ 4,477 $ 14,315 $ 12,763 $ 1,411 $ 31,294 $ 32,815 $ 66,333
Denominator:                      
Weighted average number of common shares - basic (in shares) 38,315,040 38,307,382 38,299,132 38,274,448 38,213,219 38,212,028 38,211,833 37,018,039 38,299,067 37,917,871 28,531,094
Effect of dilutive securities:                      
Unvested shares (in shares)                 183,808 404,414 315,630
Weighted average number of common shares - diluted (in shares) 38,525,598 38,768,638 38,734,987 38,671,129 38,619,472 38,614,360 38,618,824 37,322,278 38,482,875 38,322,285 28,846,724
Basic income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.07 $ 0.35 $ 0.32 $ 0.09 $ 0.12 $ 0.37 $ 0.33 $ 0.04 $ 0.82 $ 0.87 $ 2.32
Diluted income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.07 $ 0.34 $ 0.31 $ 0.08 $ 0.12 $ 0.37 $ 0.33 $ 0.04 $ 0.81 $ 0.86 $ 2.30