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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of Outstanding Debt (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt $ 4,329,859,000 $ 4,659,716,000
Less current portion of Credit Facility (face amounts of $83,239 and $108,979 at June 30, 2018 and December 31, 2017, respectively, less unamortized debt issuance costs of $8,522 and $8,671 at June 30, 2018 and December 31, 2017, respectively) 74,717,000 100,308,000
Long-term debt 4,255,142,000 4,559,408,000
Face amount 83,239,000 108,979,000
Unamortized debt issuance expense 8,522,000 8,671,000
Term loan    
Debt Instrument [Line Items]    
Long-term Debt 3,967,859,000 3,894,716,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term Debt 362,000,000 765,000,000
Five Year Unsecured Term Loan Due February 2019 | Term loan    
Debt Instrument [Line Items]    
Face amount 4,005,196,000 3,932,677,000
Unamortized debt issuance expense $ 37,337,000 $ 37,961,000