Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings per Share
Adjustments to net income (in dollars)	$ 0	$ 0	$ 0	$ 0
Dilutive securities (in shares)	0	0	0	0
Antidilutive securities (in shares)	0	0	0	0
Net income	$ 54,860	$ 54,558	$ 120,391	$ 108,680
Basic and diluted weighted-average shares outstanding	139,459,620	139,459,620	139,459,620	139,459,620
Basic earnings per share (in dollars per share)	$ 0.39	$ 0.39	$ 0.86	$ 0.78
Diluted earnings per share (in dollars per share)	$ 0.39	$ 0.39	$ 0.86	$ 0.78