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Net income Per Share - Reconciliation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 50,387	$ 36,826
Basic weighted-average shares outstanding	43,379	44,099
Dilutive effect of potential common stock equivalents — restricted stock units	233	187
Diluted weighted-average shares outstanding	43,612	44,286
Earnings per common share:
Basic	$ 1.16	$ 0.84
Diluted	$ 1.16	$ 0.83

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