ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - INTEREST EXPENSE (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification adjustments
Interest expense	$ 4,559,000	$ 5,694,000
Unrealized Loss on Interest Rate Hedge | Interest rate swap agreement | Reclassification out of accumulated other comprehensive income
Reclassification adjustments
Interest expense	826,000	888,000
Interest expense, net of tax	536,000	$ 577,000
Amounts in AOCI expected to be recognized over the next 12 months before tax	3,300,000
Amounts in AOCI expected to be recognized over the next 12 months, net of taxes	$ 2,100,000