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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Apr. 30, 1998
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 1,781,024   $ 1,781,024   $ 1,797,479  
Debt Issuance Costs (23,888)   (23,888)   (18,303)  
Net 1,757,136   1,757,136   1,779,176  
Less current portion of long-term debt 90,115   90,115   26,935  
Debt Issuance Costs, Current, Net 0   0   0  
Long-term debt, net of current portion, gross 1,690,909   1,690,909   1,770,544  
Long-term debt, net of current portion, debt issuance costs (23,888)   (23,888)   (18,303)  
Long-term debt, net of current portion, net 1,667,021   1,667,021   1,752,241  
Amortization of debt issuance costs 1,300 $ 1,349 2,583 $ 2,744    
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 10,000   10,000   0  
Debt Issuance Costs (7,149)   (7,149)   0  
Net $ 2,851   $ 2,851   0  
Weighted average rate on debt 4.22%   4.22%      
Revolving line of credit | Revolving line of credit borrowings due May 2024, weighted-average interest rate of 4.22% as of June 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 1,750,000   1,750,000   $ 0  
Debt Issuance Costs (16,697)   (16,697)   0  
Net $ 1,733,303   $ 1,733,303   0  
Weighted average rate on debt 4.22%   4.22%      
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 (42)   (42)   (44)  
Net $ 14,482   $ 14,482   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 $ 6,500   $ 6,500   7,188  
Debt Issuance Costs 0   0   0  
Net $ 6,500   $ 6,500   $ 7,188