Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per Share
Adjustments to net income (in dollars)	$ 0	$ 0	$ 0	$ 0
Antidilutive securities (in shares)	0	0	0	0
Numerator:
Net income	$ 74,199	$ 67,388	$ 216,556	$ 204,399
Denominator:
Basic: weighted-average shares outstanding (in shares)	132,583,902	135,466,669	133,957,192	137,643,005
Add: weighted-average equity-based awards (in shares)	293,867	208,829	274,570	166,568
Diluted: weighted-average shares outstanding (in shares)	132,877,769	135,675,498	134,231,762	137,809,573
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.50	$ 1.62	$ 1.48
Diluted earnings per share (in dollars per share)	$ 0.56	$ 0.50	$ 1.61	$ 1.48