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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 73,202	$ 19,855
Other comprehensive income (loss), net of tax:
Unrealized investment gains (losses) arising during the period	(112,191)	67,703
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	785	24,968
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	(111,406)	92,671
Foreign currency translation adjustment	1,270	29,869
Total other comprehensive income (loss), net of tax	(110,136)	122,540
Comprehensive income (loss)	$ (36,934)	$ 142,395

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