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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Carrying Amount $ 862,287 $ 1,079,187
Fair Value 791,212 1,016,077
2019 Euro Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 47,510 240,545
Debt Instrument, Interest Rate, Stated Percentage 1.28%  
Fair Value $ 47,103 236,337
2021 Euro Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 273,633 281,871
Debt Instrument, Interest Rate, Stated Percentage 1.28%  
Fair Value $ 256,999 268,858
2023 Euro Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 541,144 556,771
Debt Instrument, Interest Rate, Stated Percentage 1.28%  
Fair Value $ 487,110 $ 510,882
2023 Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1] 6.34%  
Long-term Line of Credit, Noncurrent $ 0  
[1] Based on the three month LIBOR of 2.34% as at June 30, 2018.