OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
OTHER LONG-TERM LIABILITIES [Abstract]
Accrued pension liabilities	$ 36,405	$ 39,453
Accrued Income Taxes, Noncurrent	17,985	17,807
Accrued Employee Benefits	14,452	15,140
Deferred Revenue, Noncurrent	13,952	11,928
Other	5,530	4,697
Other Liabilities, Noncurrent	$ 88,324	$ 89,025