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OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of AOCI Into Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other investment gains (losses)	$ (43,419)	$ (2,864)	$ (57,835)	$ (21,361)
OTTI losses	(1,674)	(1,528)	(2,088)	(8,082)
Income before income taxes and interest in income (loss) of equity method investments	101,132	94,328	173,301	110,613
Foreign exchange (losses) gains	44,099	(36,118)	6,239	(57,583)
Income tax (expense) benefit	(996)	3,333	40	12,670
Net income available to common shareholders	92,858	85,030	155,406	90,045
Non-cash foreign exchange losses			0	24,149	$ 24,000
Unrealized investment gains (losses) on available for sale investments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other investment gains (losses)	(37,426)	3,092	(32,899)	(16,112)
OTTI losses	(1,674)	(1,528)	(2,088)	(8,082)
Income before income taxes and interest in income (loss) of equity method investments	(39,100)	1,564	(34,987)	(24,194)
Income tax (expense) benefit	2,644	(61)	(2,253)	736
Net income available to common shareholders	(36,456)	1,503	(37,240)	(23,458)
Foreign currency translation adjustment | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Foreign exchange (losses) gains	0	0	0	(24,149)
Income tax (expense) benefit	0	0	0	0
Net income available to common shareholders	$ 0	$ 0	$ 0	$ (24,149)

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges.

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