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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		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 28,197	$ 29,797	$ 79,532	$ 72,341	$ 17,393
Basic weighted-average shares outstanding (in shares)	47,367	48,119	47,544	48,231
Dilutive effect of potential common stock equivalents — stock options and restricted stock units (in shares)	319	233	299	198
Diluted weighted-average shares outstanding (in shares)	47,686	48,352	47,843	48,429
Earnings per common share:
Basic (in dollars per share)	$ 0.60	$ 0.62	$ 1.67	$ 1.50
Diluted (in dollars per share)	$ 0.59	$ 0.62	$ 1.66	$ 1.49
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive	0	0	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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