Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Combined effects of tax reform				$ 86,044	$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%		28.10%
Increase (decrease) to NOL carryforwards due to error correction	$ (3,700)
Increase (decrease) to tax credits and other carryfowards due to error correction	(3,400)
Increase (decrease) to deferred tax assets, accrued employee benefits, due to error correction	7,100
Overstatement of deferred tax assets					8,200
Income Tax (Textual) [Abstract]
Valuation Allowance Adjustment				$ (90,817)	5,163	84,530
Operating Loss Carryforwards, Valuation Allowance	13,400			13,400
Change In Permanent Reinvestment Assertion				0	0	3,659
Tax Benefits associated with Net Operating Loss Carryforwards in Federal, State and Foreign Jurisdictions	39,884			39,884	81,920
Tax Benefits that Do Not Expire	18,500			18,500
Valuation Allowance	(21,629)			(21,629)	(116,770)
Change in Valuation Allowance, Current Year				$ 2,900
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent				1.90%
Deferred Tax Assets, Tax Credit Carryforwards	644			$ 644	37,603
Unremitted Earnings of Non-U.S. Subsidiaries and Affiliates	1,300,000			1,300,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,800			5,800	2,600	3,100
Increase (reduction) in Interest				700	200	(200)
Interest Accrued	1,100			1,100	500
Penalties Accrued	100			100
Deferred Tax Assets, Other						11,900
Reasonably Possible amount of Unrecognized Tax Benefits within next 12 Months Could Decrease	3,100			3,100
Provisional tax expense for the deemed repatriation of undistributed foreign earnings				80,900
Provisional tax expense for revaluation of U.S. net deferred taxes				5,100
Estimated cash payment related to provisional tax expense for the deemed repatriation of undistributed foreign earnings	3,500			3,500
Taxes Payable	3,200			3,200
Expiring Year Fifteen Through Twenty [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	4,600			4,600
Expiring Year Ten Through Fifteen [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	2,900			2,900
Expiring Year Five Through Ten [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	2,900			2,900
Expiring Through Year Five [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	11,000			11,000
Valuation Allowance, Operating Loss Carryforwards [Member]
Income Tax (Textual) [Abstract]
Valuation Allowance Adjustment					$ 1,300	81,200
Change in Valuation Allowance, Current Year						105,900
Other Comprehensive Income (Loss) [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]
Income Tax (Textual) [Abstract]
Change in Valuation Allowance, Current Year						$ 24,700
Expiring Year Five Through Ten [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards	300			300
Expiring Through Year Five [Member]
Income Tax (Textual) [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards	$ 300			300
Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Income Tax Expense (Benefit) [Member]
Income Tax (Textual) [Abstract]
Quantifying Misstatement in Current Year Financial Statements, Amount				5,300
Release of U.S. valuation allowance [Member]
Income Tax (Textual) [Abstract]
Valuation Allowance Adjustment				91,300
Deferred Tax Asset Valuation Allowance [Member]
Income Tax (Textual) [Abstract]
Change in Valuation Allowance, Current Year				$ 95,100