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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Carrying Amount $ 1,013,944 $ 999,209
Fair Value $ 891,456 $ 806,349
2015 Convertible Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage   5.00%
2021 Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1] 9.15%  
Long-term Line of Credit, Noncurrent $ 0  
2018 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 267,575 $ 263,734
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 250,805 233,297
2019 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 251,160 247,594
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 224,034 203,314
2021 Euro Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying Amount $ 495,209 487,881
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Fair Value $ 416,617 $ 369,738
[1] (2) As at March 31, 2017, the aggregate principal amount available under the 2021 Revolving Credit Facility was undrawn.