FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross unrealized gains associated with the investment held in the rabbi trust	$ 54,000	$ 28,000
Combined fair value of available-for-sale securities	100,000		100,000
Gross unrealized gains	100,000		100,000
Transfers in out between levels	0		0
Fair value of long-term debt	223,800,000
Carrying amount of long-term debt	220,900,000
Investments held in Rabbi Trust [Member] | SERP [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross unrealized gains associated with the investment held in the rabbi trust	800,000		700,000
Available-for-sale securities measured at fair value	$ 6,600,000		$ 6,500,000