ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Less: Amounts reclassified from accumulated other comprehensive income, net	$ 10,239
Accumulated Net Investment Gain (Loss) Attributable to Parent | Other Income (Expense)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Less: Amounts reclassified from accumulated other comprehensive income, net	7,800
Accumulated Net Investment Gain (Loss) Attributable to Parent | Interest Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Less: Amounts reclassified from accumulated other comprehensive income, net	$ 2,400