SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI
Beginning balance	$ 1,186,724	$ 1,127,758	$ 1,115,840	$ 1,065,161	$ 1,115,840	$ 527,126
Other comprehensive income (loss)	403	(240)	(258)	0	(95)	0
Ending balance	1,183,550	$ 1,186,724	1,127,758	$ 1,115,148	1,183,550	$ 1,115,148
AOCI
AOCI
Beginning balance			$ (823)		(823)
Ending balance	$ (918)				$ (918)