Income Taxes Income Taxes - Reconciliation of Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure - Uncertain Tax Positions [Abstract]
Valuation Allowances and Reserves, Balance		$ (206,586)	$ (4,200)	$ 0
Tax Credit Carryforward [Line Items]
Uncertain tax positions - next 12 months	$ 8,300
Valuation Allowances and Reserves, Deductions	56,026	0	0
Valuation Allowances and Reserves, Additions for Adjustments	(14,065)	(56,026)	0
Valuation Allowances and Reserves, Period Increase (Decrease)	(38,415)	(146,360)	(4,200)
Uncertain tax positions at end of year	17,903	5,566
Deferred Tax Assets, Valuation Allowance	$ (203,040)	$ (206,586)	$ (4,200)