Income Taxes - Carryforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Additions based on tax positions related to the current year	$ 600
Deferred tax asset, increase (decrease) allowance	10,400
Operating loss carryforwards	1,500
Net operating loss carryforwards	$ 116,275	$ 172,944