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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2017
Dec. 31, 2018
Apr. 30, 1998
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 1,773,967     $ 1,797,479  
Debt Issuance Costs (17,001)     (18,303)  
Net 1,756,966     1,779,176  
Less current portion of long-term debt 47,465     26,935  
Debt Issuance Costs, Current, Net 0     0  
Long-term debt, net of current portion, gross 1,726,502     1,770,544  
Long-term debt, net of current portion, debt issuance costs (17,001)     (18,303)  
Long-term debt, net of current portion, net 1,709,501     1,752,241  
Amortization of debt issuance costs 1,302 $ 1,376      
Gain (Loss) on Extinguishment of Debt     $ 1,800    
Revolving line of credit | Revolving line of credit borrowings due August 2022, weighted-average interest rate of 4.24% and 4.06% as of March 31, 2019 and December 31, 2018, respectively          
Debt Instrument [Line Items]          
Long-term Debt, Gross 178,323     178,146  
Debt Issuance Costs (4,852)     (5,216)  
Net $ 173,471     $ 172,930  
Weighted average rate on debt 4.24%     4.06%  
Term loan facility | Term Loan Due August 2022          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 1,575,000     $ 1,597,500  
Debt Issuance Costs (12,105)     (13,043)  
Net $ 1,562,895     $ 1,584,457  
Weighted average rate on debt 4.25%     4.05%  
Senior notes | 7.55% senior debentures due April 2028          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 14,645     $ 14,645  
Debt Issuance Costs (44)     (44)  
Net $ 14,601     14,601  
Stated rate on debt 7.55%       7.55%
Other debt | Various debt instruments with maturities through 2024          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 5,999     7,188  
Debt Issuance Costs 0     0  
Net $ 5,999     $ 7,188