FAIR VALUE (Details) - USD ($) $ in Thousands	Mar. 31, 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	289	663
Total assets at fair value	289	663
Liabilities
Foreign exchange contracts, liabilities	1,106	1,604
Cross currency swap contract, liability	23,530	16,309
Total liabilities at fair value	24,636	17,913
Assets and liabilities measured at fair value on recurring basis | Level 2
Assets
Foreign exchange contracts, assets	289	663
Total assets at fair value	289	663
Liabilities
Foreign exchange contracts, liabilities	1,106	1,604
Cross currency swap contract, liability	23,530	16,309
Total liabilities at fair value	$ 24,636	$ 17,913