Net Income Per Share - Reconciliation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 93,570	$ 72,483	$ 188,145	$ 122,872
Basic weighted-average shares outstanding	43,145	43,434	43,162	43,406
Dilutive effect of potential common stock equivalents — restricted stock units	95	207	144	214
Diluted weighted-average shares outstanding	43,240	43,641	43,306	43,620
Net income per common share:
Basic	$ 2.17	$ 1.67	$ 4.36	$ 2.83
Diluted	$ 2.16	$ 1.66	$ 4.34	$ 2.82