ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) -Reclassifications Line Items (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification adjustments
Interest expense	$ 2,783,000	$ 4,288,000	$ 15,387,000	$ 13,150,000
Unrealized Loss on Interest Rate Hedge | Interest rate swap agreement
Reclassification adjustments
Amounts in AOCI expected to be recognized over the next 12 months before tax	1,900,000		1,900,000
Amounts in AOCI expected to be recognized over the next 12 months, net of taxes	1,200,000		1,200,000
Unrealized Loss on Interest Rate Hedge | Interest rate swap agreement | Reclassification out of accumulated other comprehensive income
Reclassification adjustments
Interest expense	474,000	798,000	1,800,000	2,400,000
Interest expense, net of tax	$ 308,000	$ 519,000	$ 1,200,000	$ 1,600,000