Income Taxes Income Taxes Details 5 (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Non-current deferred tax assets	$ 673	$ 873
Non-current deferred tax liabilities	(404,627)	(283,765)
Net deferred income tax liability	$ (403,954)	$ (282,892)

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant