Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings (numerator)
Net income attributable to common stockholders	$ 27,152	$ 38,060	$ 68,353	$ 106,060
Shares (denominator)
Weighted average common shares outstanding (basic)	51,825	50,998	51,563	50,687
Dilutive effect of stock options and stock awards outstanding	904	871	1,049	1,012
Adjusted weighted average common shares outstanding (diluted)	52,729	51,869	52,612	51,699
Earnings per share attributable to common stockholders
Basic	$ 0.52	$ 0.75	$ 1.33	$ 2.09
Diluted	$ 0.51	$ 0.73	$ 1.30	$ 2.05
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive		3	3	107