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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Maturities of long-term debt and credit facilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 $ 0  
2020 0  
2021 168,902  
2022 0  
2023 526,697  
2024 and thereafter 0  
Total long-term debt and credit facilities 695,599  
Debt Issuance Costs, Noncurrent, Net 8,928 $ 9,660
Carrying amount of long-term debt and credit facilities 690,883  
Senior Debt and Credit Facilities [Member]    
Debt Instrument [Line Items]    
Debt Issuance Costs, Noncurrent, Net [1] $ 4,716  
[1] (1) Debt issuance costs related to the 2021 Euro Loan, the 2023 Euro Loan and the 2023 Revolving Credit Facility (each as defined below) are being amortized on a straight-line basis, which approximates the effective interest method, over the life of the respective instruments. Debt issuance costs related to the 2023 Revolving Credit Facility are classified as non-current assets in our condensed consolidated balance sheet