Income Taxes (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 27, 2017
Income Taxes [Abstract]
Deferred Tax Liability from Reclassified Intangible Asset				$ 8,700,000
Deferred Tax Liability from Reclassified Indefinite-lived Intangible	$ 4,000,000
Deferred Tax Asset, remeasured	171,400,000
Deferred Income Tax Expense (Benefit)	(12,661,000)	$ 0	$ 0
Valuation Allowance, Deferred Tax Asset, Change in Amount	121,100,000
Operating Loss Carryforwards, Federal	851,400,000
Operating Loss Carryforwards, State	$ 382,000,000
Income Tax Expense (Benefit)		$ 0	$ 0