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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 108,781	$ 73,202
Other comprehensive income (loss), net of tax:
Unrealized investment gains (losses) arising during the period	190,173	(112,191)
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income	13,370	785
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	203,543	(111,406)
Foreign currency translation adjustment	2,662	1,270
Total other comprehensive income (loss), net of tax	206,205	(110,136)
Comprehensive income (loss)	$ 314,986	$ (36,934)

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