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OTHER COMPREHENSIVE INCOME (LOSS) (Tax Effects of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Before Tax Amount
Total other comprehensive income (loss), net of tax	$ (78)	$ 56,594	$ (193,429)	$ 270,453
Tax (Expense) Benefit
Total other comprehensive income (loss), net of tax	935	713	6,233	(6,999)
Net of Tax Amount
Total other comprehensive income (loss), net of tax	857	57,307	(187,196)	263,454
Available for sale investments
Before Tax Amount
Unrealized investment gains (losses) arising during the period	(27,968)	64,431	(266,117)	215,360
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income	26,896	(15,925)	79,552	8,269
Total other comprehensive income (loss), net of tax	(1,072)	48,506	(186,565)	223,629
Tax (Expense) Benefit
Unrealized investment gains (losses) arising during the period	1,907	(1,926)	8,596	(8,899)
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income	(972)	2,639	(2,363)	1,900
Total other comprehensive income (loss), net of tax	935	713	6,233	(6,999)
Net of Tax Amount
Unrealized investment gains (losses) arising during the period	(26,061)	62,505	(257,521)	206,461
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income	25,924	(13,286)	77,189	10,169
Total other comprehensive income (loss), net of tax	(137)	49,219	(180,332)	216,630
Non-credit portion of OTTI losses
Before Tax Amount
Total other comprehensive income (loss), net of tax	0	0	0	0
Tax (Expense) Benefit
Total other comprehensive income (loss), net of tax	0	0	0	0
Net of Tax Amount
Total other comprehensive income (loss), net of tax	0	0	0	0
Foreign currency translation adjustment
Before Tax Amount
Total other comprehensive income (loss), net of tax	994	8,088	(6,864)	46,824
Tax (Expense) Benefit
Total other comprehensive income (loss), net of tax	0	0	0	0
Net of Tax Amount
Total other comprehensive income (loss), net of tax	$ 994	$ 8,088	$ (6,864)	$ 46,824

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