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Financial Instruments (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 524,931 $ 515,919
Less: current portion (1,224) (1,799)
Long-term debt, net of current portion 523,707 514,120
Credit Agreement [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 499,000 $ 501,000
Interest rate at end of period 3.69% 3.40%
Maturity date range, end Dec. 31, 2022  
Private Placement, Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt  
Interest rate   6.84%
Finance obligations [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 25,931 $ 14,919
Interest rate 5.00%  
Maturity date range, end Dec. 31, 2022