FAIR VALUE MEASUREMENTS Assets Measured at Fair Value Subject to Three-Tier Hierarchy (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair value, level transfers	$ 0	$ 0
Recurring Basis | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Total - assets	36,838,000	32,834,000
Recurring Basis | Fair Value, Inputs, Level 1 | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis
Cash and cash equivalents	49,000	5,452,000
Recurring Basis | Fair Value, Inputs, Level 1 | Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis
Mutual funds	35,813,000	26,715,000
Recurring Basis | Fair Value, Inputs, Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis
Mutual funds	976,000	667,000
Recurring Basis | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Total - net liabilities	(3,436,000)	(1,934,000)
Recurring Basis | Fair Value, Inputs, Level 2 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative asset	112,000
Derivative liability	$ (3,548,000)	$ (1,934,000)