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Debt Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2014
Jun. 03, 2014
Debt Instrument [Line Items]        
Notes $ 938,061 $ 936,727    
Long-term debt, gross 1,685,000 1,685,000    
Less current portion (5,625) 0    
Long term debt, gross, excluding current maturities 1,679,375 1,685,000    
Less debt issuance costs and original issue discount (21,807) (24,485)    
Long-term debt, noncurrent $ 1,657,568 $ 1,660,515    
April 2017 U.S. term loan averaging 3.83% in 2018; 3.43% in 2017 (due 2017-2024)        
Debt Instrument [Line Items]        
Interest rate during period 3.83% 3.43%    
Term debt $ 735,000 $ 735,000    
April 2017 U.S. fixed rate notes at 5.375% (due 2027)        
Debt Instrument [Line Items]        
Stated interest rate percentage 5.375%      
Notes $ 500,000 500,000    
June 2014 U.S. fixed rate notes at 5.375% (due 2024)        
Debt Instrument [Line Items]        
Stated interest rate percentage 5.375%     5.375%
Notes $ 450,000 $ 450,000 $ 450,000