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Basis of Presentation - Reconciliation of BEPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reconciliation of basic earnings per share ("EPS") to diluted EPS          
Net income available to common stockholders $ 29,797 $ 14,732 $ 21,595 $ 72,341 $ 53,156
Basic weighted-average shares outstanding (in shares) 48,119   48,998 48,231 49,157
Dilutive effect of potential common stock equivalents — stock options and restricted stock units (in shares) 233   241 198 220
Diluted weighted-average shares outstanding (in shares) 48,352   49,239 48,429 49,377
Earnings per common share:          
Basic (in dollars per share) $ 0.62   $ 0.44 $ 1.50 $ 1.08
Diluted (in dollars per share) $ 0.62   $ 0.44 $ 1.49 $ 1.08
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive 0   0 0 0