Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Income Tax Expense (Benefit)	$ (184,242)	$ 18,760	$ 105,250
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	9,000
Deferred Tax Assets, Operating Loss Carryforwards	222,065	14,140
Deferred Tax Assets, Valuation Allowance	206,586	4,200
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	56,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	$ (962)	0	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	$ 600	1,200	$ (900)
Liabilities for penalties and interest on uncertain tax	2,600	$ 3,200
Operating Loss Carryforwards	0
Operating Loss Carryforwards, Valuation Allowance	33,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	113,000
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	740,000
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Deferred Tax Assets, Valuation Allowance	56,000
Unclassified Indefinite-lived Intangible Assets [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	692,000
Finite-Lived Intangible Assets [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	48,000
Reduction in Taxes [Member]
Tax Credit Carryforward [Line Items]
Income Tax Expense (Benefit)	$ 23,100