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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, 2020	Mar. 31, 2019	Dec. 31, 2019
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 36,826	$ 22,662	$ 111,320
Basic weighted-average shares outstanding	44,099	44,874
Dilutive effect of potential common stock equivalents — restricted stock units	187	339
Diluted weighted-average shares outstanding	44,286	45,213
Earnings per common share:
Basic	$ 0.84	$ 0.51
Diluted	$ 0.83	$ 0.50

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