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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of outstanding debt (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt $ 4,771,318,000 $ 4,438,612,000
Less current portion of corporate credit facility (face amounts of $102,129 and $187,274 at September 30, 2017 and December 31, 2016, respectively, less unamortized debt issuance costs of $8,722 and $9,526 at September 30, 2017 and December 31, 2016, respectively) and current portion of capital lease obligations of $1 and $37 at September 30, 2017 and December 31, 2016, respectively 93,408,000 177,785,000
Long-term debt 4,677,910,000 4,260,827,000
Debt instrument, face amount 102,129,000 187,274,000
Unamortized debt issuance expense 8,722,000 9,526,000
Current portion of capital lease obligation 1,000 37,000
Term loan    
Debt Instrument [Line Items]    
Long-term Debt 3,916,317,000 3,682,575,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term Debt 855,000,000 756,000,000
Capital lease obligations    
Debt Instrument [Line Items]    
Capital lease obligations 1,000 37,000
Five Year Unsecured Term Loan Due February 2019 | Term loan    
Debt Instrument [Line Items]    
Debt instrument, face amount 3,956,497,000 3,728,857,000
Unamortized debt issuance expense $ 40,180,000 $ 46,282,000