SHAREHOLDERS' EQUITY - (Reconciliation of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Net [Roll Forward]
Accumulated other comprehensive income, beginning of period	$ (3,750)
Other comprehensive income after reclassifications	14,031	$ (4,450)	$ (429)
Accumulated other comprehensive income, end of period	10,281	(3,750)
AOCI Attributable to Parent [Member]
Before Tax [Roll Forward]
Accumulated other comprehensive income, beginning of period	(5,023)	2,287
Cumulative effect of new accounting standards, before tax				$ 0	$ (1,349)
Other comprehensive income before reclassifications	20,809	(8,747)
Reclassification adjustment for realized gains included in net (loss) income	(2,165)	2,786
Change in net unrealized losses on investments, available-for-sale	18,644	(5,961)
Accumulated other comprehensive income, end of period	13,621	(5,023)	2,287
Income Tax [Roll Forward]
Accumulated other comprehensive income, beginning of period	1,273	(593)
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Tax				0	355
Other comprehensive income before reclassifications	(5,144)	2,217
Reclassification from AOCI, Current Period, Tax	531	(706)
Other comprehensive income after reclassifications	(4,613)	1,511
Accumulated other comprehensive income, end of period	(3,340)	1,273	(593)
Net [Roll Forward]
Accumulated other comprehensive income, beginning of period	(3,750)	1,694
Cumulative effect of new accounting standards				$ 0	$ (994)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	15,665	(6,530)
Reclassification adjustment for realized gains included in net (loss) income	(1,634)	2,080
Other comprehensive income after reclassifications	14,031	(4,221)	(171)
Accumulated other comprehensive income, end of period	$ 10,281	$ (3,750)	$ 1,694