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Basis of Presentation - Reconciliation of BEPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Reconciliation of basic earnings per share ("EPS") to diluted EPS      
Net income available to common stockholders $ 23,121 $ 16,343 $ 73,391
Basic weighted-average shares outstanding (in shares) 47,616 48,297  
Dilutive effect of potential common stock equivalents — stock options and restricted stock units (in shares) 290 153  
Diluted weighted-average shares outstanding (in shares) 47,906 48,450  
Earnings per common share:      
Basic (in dollars per share) $ 0.49 $ 0.34  
Diluted (in dollars per share) $ 0.48 $ 0.34  
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive 0 0