Income Taxes - Difference in Effective Tax Rate and Federal Statutory Rate (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax expense (benefit) at statutory rate (as a percent)	(35.00%)	(35.00%)	(35.00%)
Foreign and state taxes (as a percent)	3.10%	0.50%	6.20%
Non-deductible expenses and other (as a percent)	1.40%	15.50%	7.20%
Valuation allowance (as a percent)	(1.40%)	19.30%	(0.00%)
Effective tax rate (as a percent)	(31.90%)	0.30%	(21.60%)