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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 54,095	$ (457,084)	$ 230,812	$ (341,541)
Other comprehensive income (loss), net of tax:
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
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	(137)	49,219	(180,332)	216,630
Foreign currency translation adjustment	994	8,088	(6,864)	46,824
Total other comprehensive income (loss), net of tax	857	57,307	(187,196)	263,454
Comprehensive income (loss)	$ 54,952	$ (399,777)	$ 43,616	$ (78,087)

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