FAIR VALUE (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Liabilities
Fair value of long-term obligations	$ 1,100,000	$ 1,100,000
Assets and liabilities measured at fair value on recurring basis
Assets
Foreign exchange contracts, assets	680	663
Total assets at fair value	680	663
Liabilities
Foreign exchange contracts, liabilities	398	1,604
Cross currency swap contract, liability	5,484	16,309
Total liabilities at fair value	5,882	17,913
Assets and liabilities measured at fair value on recurring basis | Level 2
Assets
Foreign exchange contracts, assets	680	663
Total assets at fair value	680	663
Liabilities
Foreign exchange contracts, liabilities	398	1,604
Cross currency swap contract, liability	5,484	16,309
Total liabilities at fair value	$ 5,882	$ 17,913