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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (177,827)	$ 108,781
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(253,904)	203,543
Foreign currency translation adjustment	(7,725)	2,662
Total other comprehensive income (loss), net of tax	(261,629)	206,205
Comprehensive income (loss)	(439,456)	314,986
Unrealized gains (losses) on available for sale investments, net of tax:
Other comprehensive income (loss), net of tax:
Adjustment for reclassification of net realized (gains) losses, impairment losses and OTTI losses recognized in net income (loss)	5,648	13,370
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(253,904)	203,543
Unrealized gains (losses) on available for sale investments, net of tax: | Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) arising during period	(242,962)	190,173
Unrealized gains (losses) on available for sale investments, net of tax: | Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has been recognized
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) arising during period	$ (16,590)	$ 0

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities and for unrealized loss realized upon the write-down of available-for-sale securities.

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