Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings (numerator)
Net income attributable to common stockholders	$ 55,374	$ 21,033	$ 94,826	$ 41,201
Shares (denominator)
Weighted average common shares outstanding (basic)	44,667	51,527	44,538	51,431
Dilutive effect of stock options and stock awards outstanding	713	1,042	789	1,086
Adjusted weighted average common shares outstanding (diluted)	45,380	52,569	45,327	52,517
Earnings per share attributable to common stockholders
Basic	$ 1.24	$ 0.41	$ 2.13	$ 0.80
Diluted	$ 1.22	$ 0.40	$ 2.09	$ 0.78
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive	6	8	3	3