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Net income Per Share - Reconciliation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 22,662	$ 25,429	$ 101,204
Basic weighted-average shares outstanding	44,874	46,615
Dilutive effect of potential common stock equivalents — stock options and restricted stock units	339	394
Diluted weighted-average shares outstanding	45,213	47,009
Earnings per common share:
Basic	$ 0.51	$ 0.55
Diluted	$ 0.50	$ 0.54

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