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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Carrying Amount $ 1,047,600 $ 1,079,187
Fair Value 982,471 1,016,077
2018 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 185,523 240,545
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 180,486 236,337
2019 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 289,631 281,871
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 276,968 268,858
2021 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 572,446 556,771
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 525,017 $ 510,882
2021 Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 9.31%  
Long-term Line of Credit, Noncurrent $ 0  
[1] As at March 31, 2018, the 2021 Revolving Credit Facility was undrawn.
[2] Based on the three month LIBOR of 2.31% as at March 31, 2018.