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Long-Term Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
May 31, 2011
Apr. 30, 1998
Debt Instrument [Line Items]        
Gross $ 1,777,307 $ 1,619,279    
Debt Issuance Costs (23,737) (17,232)    
Net 1,753,570 1,602,047    
Less current portion of long-term debt 70,046 105,158    
Long-term debt, net of current portion, gross 1,707,261 1,514,121    
Long-term debt, net of current portion, debt issuance costs (23,737) (17,232)    
Long-term debt, net of current portion 1,683,524 1,496,889    
Revolving line of credit [Member] | Line of Credit due August 2022 [Member]        
Debt Instrument [Line Items]        
Gross 0 0    
Debt Issuance Costs (6,672) 0    
Net (6,672) 0    
Revolving line of credit [Member] | Revolving Line of Credit April 2020 [Member]        
Debt Instrument [Line Items]        
Gross 0 302,000    
Debt Issuance Costs 0 (4,761)    
Net 0 $ 297,239    
Debt instrument, weighted average interest rate percentage   2.31%    
Term Loan Facility [Member] | Term Loan Due August 2022 [Member]        
Debt Instrument [Line Items]        
Gross 1,755,000 $ 0    
Debt Issuance Costs (17,017) 0    
Net $ 1,737,983 0    
Debt instrument, weighted average interest rate percentage 3.28%      
Term Loan Facility [Member] | Term Loan Due April 2020 [Member]        
Debt Instrument [Line Items]        
Gross $ 0 1,298,125    
Debt Issuance Costs 0 (12,419)    
Net 0 $ 1,285,706    
Debt instrument, weighted average interest rate percentage   2.31%    
Senior Notes [Member] | 7.25% senior notes due June 2021 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated rate percentage     7.25%  
Senior Notes [Member] | 7.55% senior debentures due April 2028 [Member]        
Debt Instrument [Line Items]        
Gross 14,645 $ 14,645    
Debt Issuance Costs (48) (52)    
Net $ 14,597 14,593    
Debt instrument, stated rate percentage 7.55%     7.55%
Other debt [Member] | Various interest rates with maturities through 2019        
Debt Instrument [Line Items]        
Gross $ 7,662 4,509    
Debt Issuance Costs 0 0    
Net $ 7,662 $ 4,509