Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
	Sep. 19, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings per Share
Net income (loss)														$ 114,183	$ (14,425)	$ 18,897
Shares outstanding:
Weighted average shares outstanding		46,670,735	46,516,614	46,516,614	46,494,638									46,550,042	29,901,405	23,311,492
Weighted Average Number of Shares Outstanding, Diluted	0	47,227,127	46,763,589	46,657,618	46,494,638									47,008,980	29,901,405	23,311,492
Weighted Average Number of Shares Outstanding, Basic and Diluted						46,441,249	26,075,022	23,311,492	23,311,492	23,311,492	23,311,492	23,311,492	23,311,492	46,550,042	29,901,405	23,311,492
Basic and diluted net (loss) income per common share						$ (0.23)	$ (0.16)	$ 0.12	$ (0.10)	$ 0.30	$ 0.14	$ 0.28	$ 0.09	$ 2.43	$ (0.48)	$ 0.81
Effect of dilutive securities														47,008,980	29,901,405	23,311,492
Diluted shares outstanding	0	47,227,127	46,763,589	46,657,618	46,494,638									47,008,980	29,901,405	23,311,492
Basic (in dollars per share)														$ 2.45	$ (0.48)	$ 0.81
Diluted (in dollars per share)		$ 2.33	$ 0.12	$ 0.10	$ (0.13)									$ 2.43	$ (0.48)	$ 0.81