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FINANCING ARRANGEMENTS (Summary of Financing Arrangements) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Current portion of long-term obligations $ 4,000 $ 4,000
Long-term obligations, at par 1,637,000 1,639,000
Unamortized debt issuance costs and premium, net (12,273) (13,463)
Long-term obligations, at carrying value 1,624,727 1,625,537
Total current and long-term obligations, at carrying value 1,628,727 1,629,537
Secured debt | Term Loan Agreement    
Debt Instrument [Line Items]    
Current portion of long-term obligations 4,000 4,000
Long-term obligations, at par 392,000 394,000
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes)    
Debt Instrument [Line Items]    
Long-term obligations, at par $ 400,000 400,000
Interest rate 5.25%  
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)    
Debt Instrument [Line Items]    
Long-term obligations, at par $ 845,000 $ 845,000
Interest rate 5.125%