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LONG-TERM DEBT AND LINES OF CREDIT - Summary (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt $ 5,151,647,000 $ 5,130,243,000
Less current portion of Credit Facility 151,062,000 115,075,000
Long-term debt, excluding current portion 5,000,585,000 5,015,168,000
Term loans (face amounts of $4,419,554 and $4,463,643 at June 30, 2019 and December 31, 2018, respectively, less unamortized debt issuance costs of $32,906 and $37,400 at June 30, 2019 and December 31, 2018, respectively)    
Debt Instrument [Line Items]    
Long-term Debt 4,386,647,000 4,426,243,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term Debt 765,000,000 704,000,000
Five Year Unsecured Term Loan Due February 2019 | Term loans (face amounts of $4,419,554 and $4,463,643 at June 30, 2019 and December 31, 2018, respectively, less unamortized debt issuance costs of $32,906 and $37,400 at June 30, 2019 and December 31, 2018, respectively)    
Debt Instrument [Line Items]    
Face amount of debt instrument 4,419,554,000 4,463,643,000
Unamortized debt issuance costs $ 32,906,000 $ 37,400,000