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Net Income per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income $ 32,693 $ 13,787
Less distributed and undistributed earnings allocated to participating securities 664 355
Net income allocated to common shares $ 32,029 $ 13,432
Weighted average common shares outstanding (in shares) 20,972 24,716
Incremental shares from assumed conversions of common stock options (in shares) 6 8
Adjusted weighted average common shares outstanding (in shares) 20,978 24,724