Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per Share
Adjustments to net income (in dollars)	$ 0	$ 0	$ 0	$ 0
Antidilutive securities (in shares)	353,000	0	352,000	0
Numerator:
Net income	$ 65,101	$ 74,199	$ 124,015	$ 216,556
Denominator:
Basic: weighted-average shares outstanding (in shares)	129,896,054	132,583,902	129,882,878	133,957,192
Add: weighted-average equity-based awards (in shares)	189,480	293,867	246,812	274,570
Diluted: weighted-average shares outstanding (in shares)	130,085,534	132,877,769	130,129,690	134,231,762
Basic earnings per share (in dollars per share)	$ 0.50	$ 0.56	$ 0.95	$ 1.62
Diluted earnings per share (in dollars per share)	$ 0.50	$ 0.56	$ 0.95	$ 1.61