Income Taxes - Allocation of Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 7,147	$ 808	$ 115,507
Income tax expense (benefit)	2,003	(300)	(127)
Total income tax expense	$ 9,150	$ 508	$ 115,380