Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings per Share
Adjustments to net income (in dollars)	$ 0	$ 0	$ 0	$ 0
Antidilutive securities (in shares)	0	0	0	0
Numerator:
Net income	$ 53,235	$ 54,889	$ 173,626	$ 163,569
Denominator:
Basic: weighted-average shares outstanding (in shares)	139,500,542	139,459,620	139,473,360	139,459,620
Add: weighted-average equity-based awards (in shares)	3,016		1,013
Diluted: weighted-average shares outstanding (in shares)	139,503,558	139,459,620	139,474,373	139,459,620
Basic earnings per share (in dollars per share)	$ 0.38	$ 0.39	$ 1.24	$ 1.17
Diluted earnings per share (in dollars per share)	$ 0.38	$ 0.39	$ 1.24	$ 1.17