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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Apr. 30, 1998
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 1,727,093     $ 1,727,093   $ 1,797,479  
Debt Issuance Costs (22,574)     (22,574)   (18,303)  
Net 1,704,519     1,704,519   1,779,176  
Less current portion of long-term debt 68,247     68,247   26,935  
Debt Issuance Costs, Current, Net 0     0   0  
Long-term debt, net of current portion, gross 1,658,846     1,658,846   1,770,544  
Long-term debt, net of current portion, debt issuance costs (22,574)     (22,574)   (18,303)  
Long-term debt, net of current portion, net 1,636,272     1,636,272   1,752,241  
Amortization of debt issuance costs 1,200   $ 1,400 3,836 $ 4,103    
Gain (Loss) on Extinguishment of Debt   $ (1,500)   (1,453) $ 0    
Revolving line of credit | Line of Credit Due May 2024              
Debt Instrument [Line Items]              
Long-term Debt, Gross 0     0   0  
Debt Issuance Costs (6,786)     (6,786)   0  
Net $ (6,786)     $ (6,786)   0  
Weighted average rate on debt 4.00%     4.00%      
Revolving line of credit | Revolving line of credit borrowings due May 2024, weighted-average interest rate of 4.00% as of September 30, 2019              
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 0     $ 0   178,146  
Debt Issuance Costs 0     0   (5,216)  
Net 0     0   $ 172,930  
Weighted average rate on debt           4.05%  
Term loan facility | Term Loan Due May 2024 [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross 1,706,250     1,706,250   $ 0  
Debt Issuance Costs (15,747)     (15,747)   0  
Net $ 1,690,503     $ 1,690,503   0  
Weighted average rate on debt 4.00%     4.00%      
Term loan facility | Term Loan Due August 2022              
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 0     $ 0   1,597,500  
Debt Issuance Costs 0     0   (13,043)  
Net 0     0   $ 1,584,457  
Weighted average rate on debt           4.05%  
Senior notes | 7.55% senior debentures due April 2028              
Debt Instrument [Line Items]              
Long-term Debt, Gross 14,524     14,524   $ 14,645  
Debt Issuance Costs (41)     (41)   (44)  
Net $ 14,483     $ 14,483   14,601  
Stated rate on debt 7.55%     7.55%     7.55%
Other debt | Various debt instruments with maturities through March 2024              
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 6,319     $ 6,319   7,188  
Debt Issuance Costs 0     0   0  
Net $ 6,319     $ 6,319   $ 7,188