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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of AOCI into net income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other realized investment gains (losses)									$ 42,719	$ (34,315)	$ (65,771)
OTTI losses									(14,493)	(26,210)	(72,720)
Income (loss) before income taxes and interest in income (loss) of equity method investments									(368,109)	521,802	644,659
Foreign exchange losses									(134,737)	121,295	102,312
Income tax (expense) benefit									7,542	(6,340)	(3,028)
Net income (loss) available to common shareholders	$ (38,081)	$ (467,740)	$ 85,030	$ 5,014	$ 130,912	$ 176,644	$ 119,491	$ 38,417	(415,779)	465,462	601,562
Non-cash foreign exchange losses									24,149	0	0
Unrealized 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 realized investment gains (losses)									48,385	(34,213)	(73,046)
OTTI losses									(14,493)	(26,210)	(72,720)
Income (loss) before income taxes and interest in income (loss) of equity method investments									33,892	(60,423)	(145,766)
Income tax (expense) benefit									(758)	(1,767)	775
Net income (loss) available to common shareholders									33,134	(62,190)	(144,991)
Cumulative foreign currency translation adjustments, net of tax | 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									(24,149)	0	0
Income tax (expense) benefit									0	0	0
Net income (loss) available to common shareholders									$ (24,149)	$ 0	$ 0

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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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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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