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Net Income per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 35,628 $ 32,693
Less distributed and undistributed earnings allocated to participating securities 781 664
Net Income (Loss) Available to Common Stockholders, Basic $ 34,847 $ 32,029
Weighted average common shares outstanding basic (in shares) 20,565 20,972
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 101 6
Weighted Average Number of Shares Outstanding, Diluted 20,666 20,978