Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act, income tax expense		$ 3,500,000
Income tax benefit	$ 1,100,000
Federal and state tax liability, benefit from income taxes		(4,700,000)
Reduction in deferred tax assets and corresponding valuation allowance	25,000,000
Refund claimed for taxes previously paid	5,000,000
Minimum
Operating Loss Carryforwards [Line Items]
Estimate of unrecognized tax benefits that may be realized over the next twelve months	0
Maximum
Operating Loss Carryforwards [Line Items]
Estimate of unrecognized tax benefits that may be realized over the next twelve months	5,000,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforwards	$ 315,500,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Income tax benefit		$ (1,400,000)