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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 58,037 $ 49,350 $ 162,540 $ 141,924
Income attributable to unvested participating securities, basic EPS (494) (379) (1,353) (1,196)
Net income used in calculating basic EPS $ 57,543 $ 48,971 $ 161,187 $ 140,728
Weighted-average vested shares 47,008 50,082 47,736 51,494
Basic EPS $ 1.22 $ 0.98 $ 3.38 $ 2.73
Income attributable to unvested participating securities, diluted EPS $ (493) $ (379) $ (1,352) $ (1,196)
Net income used in calculating diluted EPS $ 57,544 $ 48,971 $ 161,188 $ 140,728
Dilutive effect of incremental shares to be issued for contingently issuable shares 43 22 39 32
Weighted-average shares used in calculating diluted EPS 47,051 50,104 47,775 51,526
Diluted EPS $ 1.22 $ 0.98 $ 3.37 $ 2.73