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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of Outstanding Debt (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total $ 4,659,716,000 $ 4,438,612,000
Less current portion of Credit Facility (face amounts of $108,979 and $187,274 at December 31, 2017 and 2016, respectively, less unamortized debt issuance costs of $8,671 and $9,526 at December 31, 2017 and 2016, respectively) and current portion of capital lease obligations of $37 at December 31, 2016 100,308,000 177,785,000
Long-term debt 4,559,408,000 4,260,827,000
Face amount of debt instrument 108,979,000 187,274,000
Unamortized debt issue costs 8,671,000 9,526,000
Current portion of capital lease obligations 0 37,000
Term loans    
Debt Instrument [Line Items]    
Total 3,894,716,000 3,682,575,000
Line of Credit    
Debt Instrument [Line Items]    
Total 765,000,000 756,000,000
Notes Payable, Other Payables    
Debt Instrument [Line Items]    
Capital Lease Obligations 0 37,000
Five Year Unsecured Term Loan Due February 2019 | Term loans    
Debt Instrument [Line Items]    
Face amount of debt instrument 3,932,677,000 3,728,857,000
Unamortized debt issue costs $ 37,961,000 $ 46,282,000