FAIR VALUE (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Liabilities
Fair value of long-term obligations	$ 1,100,000	$ 739,000
Assets and liabilities measured at fair value on recurring basis | Total
Assets
Foreign exchange contracts, assets	663	1,612
Total assets at fair value	663	1,612
Liabilities
Foreign exchange contracts, liabilities	1,604	2,881
Cross currency swap contract, liability	16,309
Total liabilities at fair value	17,913	2,881
Assets and liabilities measured at fair value on recurring basis | Level 2
Assets
Foreign exchange contracts, assets	663	1,612
Total assets at fair value	663	1,612
Liabilities
Foreign exchange contracts, liabilities	1,604	2,881
Cross currency swap contract, liability	16,309
Total liabilities at fair value	$ 17,913	$ 2,881