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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share    
Net income attributable to common shares $ 16,292 $ 11,261
Weighted-average common shares outstanding - basic 33,558,787 30,252,693
Effect of potentially dilutive common shares:    
Stock options 156,035 200,379
Unvested awards 266,954 241,675
Weighted-average common shares outstanding - diluted 33,981,776 30,694,747
Net income per share attributable to common shares    
Basic (in dollars per share) $ 0.49 $ 0.37
Diluted (in dollars per share) $ 0.48 $ 0.37
Weighted-average potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share 39,937 59,408