ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) -Reclassifications Line Items (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification adjustments
Interest expense	$ 2,907,000	$ 8,474,000	$ 5,716,000	$ 12,604,000
Unrealized Gain (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	477,000		477,000
Amounts in AOCI expected to be recognized over the next 12 months, net of taxes	377,000		377,000
Unrealized Gain (Loss) on Interest Rate Hedge | Interest rate swap agreement | Reclassification out of accumulated other comprehensive income
Reclassification adjustments
Interest expense	119,000	603,000	392,000	1,300,000
Interest expense, net of tax	$ 94,000	$ 392,000	$ 310,000	$ 873,000