Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Federal and state tax liability, benefit from income taxes	$ 0.4	$ 16.8
Income tax benefit	0.4
Reduction in deferred tax assets and corresponding valuation allowance	3.8
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforwards	$ 187.4