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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Financing Transactions (Details)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                    
Repayments of debt       $ (132,000) € (110.0) $ (61,600) € (50.0) $ (270,780) $ (59,060) $ (430,030)
2023 Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility maximum borrowing capacity               $ 75,000    
2019 Euro Loan [Member]                    
Debt Instrument [Line Items]                    
Repayments of debt   $ (47,900) € (40.8)              
2021 Euro Loan [Member]                    
Debt Instrument [Line Items]                    
Repayments of debt   (29,300) € (25.0)              
Guarantee Fee Payable, Related Parties [Domain]                    
Debt Instrument [Line Items]                    
Interest Paid, Excluding Capitalized Interest, Operating Activities   $ 41,200                
Subsequent Event [Member]                    
Debt Instrument [Line Items]                    
Repayments of Debt | € € 60.0