FAIR VALUE MEASUREMENT (Details) $ in Thousands	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of life insurance policies | item	70
Life insurance policies, net face value	$ 42,200
Cash surrender value of life insurance policies	12,900	$ 12,700
Deferred compensation assets	$ 14,000	$ 13,700
Defined Contribution Pension [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents
Total fair value
Defined Contribution Pension [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 140	$ 62
Total fair value	140	62
Defined Contribution Pension [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	140	62
Total fair value	$ 140	$ 62