ACCUMULATED OTHER COMPREHENSIVE LOSS (Reclassification out of AOCI) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ 905,000	$ (427,000)	$ (564,000)	$ 2,983,000	$ (4,061,000)	$ (996,000)	$ 846,000	$ (299,000)	$ 2,897,000	$ (4,510,000)	$ (6,119,000)
Interest expense, net of interest income									78,670,000	81,094,000	85,808,000
Unrealized (Losses) Gains on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net									(332,000)	0	(222,000)
Unrealized Loss on Interest Rate Hedge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest income									$ (2,335,000)	$ (806,000)	$ 0