Restatement of Previously Issued Financial Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained Earnings (Accumulated Deficit)	$ (297,209)	$ (301,008)	$ (298,930)	$ (297,668)
Change in Accounting Estimate, Financial Effect			1.9
Prior Period Reclassification Adjustment	$ 800	$ 11,000	$ (11,042)