OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Long-Term Liabilities [Abstract]
Defined benefit pension plan liabilities	$ 60,007	$ 42,509
Post-retirement medical plan liabilities	22,740	17,729
Environmental liabilities	142,935	8,189
Other	429	1,397
Other long-term liabilities	$ 226,111	$ 69,824