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LONG-TERM DEBT AND LINES OF CREDIT - Summary (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt $ 5,303,396,000 $ 5,130,243,000
Less current portion of Credit Facility (face amounts of $142,044 and $124,176 at March 31, 2019 and December 31, 2018, respectively, less unamortized debt issuance costs of $9,086 and $9,101 at March 31, 2019 and December 31, 2018, respectively, and the current portion of capital lease obligations of $62) 133,019,000 115,075,000
Long-term debt, excluding current portion 5,170,377,000 5,015,168,000
Face amount of debt instrument 142,044,000 124,176,000
Unamortized debt issuance costs 9,086,000 9,101,000
Current portion of capital lease obligations 62,000  
Term loans (face amounts of $4,441,578 and $4,463,643 at March 31, 2019 and December 31, 2018, respectively, less unamortized debt issuance costs of $35,182 and $37,400 at March 31, 2019 and December 31, 2018, respectively)    
Debt Instrument [Line Items]    
Long-term Debt 4,406,396,000 4,426,243,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term Debt 897,000,000 704,000,000
Five Year Unsecured Term Loan Due February 2019 | Term loans (face amounts of $4,441,578 and $4,463,643 at March 31, 2019 and December 31, 2018, respectively, less unamortized debt issuance costs of $35,182 and $37,400 at March 31, 2019 and December 31, 2018, respectively)    
Debt Instrument [Line Items]    
Face amount of debt instrument 4,441,578,000 4,463,643,000
Unamortized debt issuance costs $ 35,182,000 $ 37,400,000