Goodwill - Changes in Goodwill Balance (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance		$ 10,358	$ 347,382
Acquisitions			10,358
Dispositions			(12,070)
Spin-off			(103,042)
Goodwill impairment charge	$ (232,300)	0	(232,270)
Goodwill, Ending Balance		$ 10,358	$ 10,358