Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Income Tax Expense (Benefit)	$ 26,494	$ (184,242)	$ 18,760
Deferred Tax Assets, Operating Loss Carryforwards	189,644	222,065
Deferred Tax Assets, Valuation Allowance	203,040	206,586	4,200
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	(962)	$ 0
Unrecognized Tax Benefits, Probability Threshold of Realizing for Tax Benefits Recognition, Minimum Percentage			50.00%
Penalties and interest expense relating to uncertain tax positions	1,700	600
Liabilities for penalties and interest on uncertain tax	4,300	$ 2,600
Operating Loss Carryforwards	0
Operating Loss Carryforwards, Valuation Allowance	203,000
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	781,000
Unclassified Indefinite-lived Intangible Assets [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	711,000
Finite-Lived Intangible Assets [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	$ 70,000