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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings (numerator)
Net income attributable to common stockholders	$ 21,033	$ 36,284	$ 41,201	$ 68,000
Shares (denominator)
Weighted average common shares outstanding (basic)	51,527	50,658	51,431	50,529
Dilutive effect of stock options and stock awards outstanding	1,042	962	1,086	1,037
Adjusted weighted average common shares outstanding (diluted)	52,569	51,620	52,517	51,566
Earnings per share attributable to common stockholders
Basic	$ 0.41	$ 0.72	$ 0.80	$ 1.35
Diluted	$ 0.40	$ 0.70	$ 0.78	$ 1.32
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive	8	131	3	95