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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Tax Act, one-time net tax benefit recorded   $ 70,100  
Tax Act, benefits associated with re-measurement of deferred tax assets and liabilities   85,300  
Tax Act, transition tax expense on post-1986 earnings and profits of certain foreign subsidiaries   15,200  
Tax Act, additional benefit recorded related to remeasurement $ 6,300    
Valuation allowance against previously recognized foreign tax credits 43,500    
Tax Act, benefit associated with entity restructuring and recapitalization   26,700  
Tax Act, decrease in benefit associated with entity restructuring and recapitalization 1,800    
Tax Act, expense associated with acceleration of certain deductions   8,500  
Valuation allowance for deferred income tax assets 67,601 19,328 $ 15,000
Change in total valuation allowance 48,300 4,300 (1,100)
Tax effect of state and foreign net operating loss carryforwards 52,406 62,925  
2019 200    
2020 1,700    
2021 500    
2022 200    
2023 1,300    
Thereafter 53,200    
Valuation allowance foreign and state net operating loss carryforwards 21,900    
Reduction due to expiration of certain federal and state statutes of limitations 7,857 8,252 23,448
Interest and penalties expense (income) in the provision for income taxes 100 $ 200 $ 3,200
Gross Amount Before Balance Sheet Presentation Netting      
Income Taxes [Line Items]      
Tax effect of state and foreign net operating loss carryforwards $ 57,100