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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (120,424)	$ 323,473	$ 43,021
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the year, net of reclassification adjustment	239,114	349,886	(190,829)
Foreign currency translation adjustment	3,571	(1,066)	(11,165)
Total other comprehensive income (loss), net of tax	242,685	348,820	(201,994)
Comprehensive income (loss)	122,261	672,293	(158,973)
Unrealized gains (losses) on available for sale investments
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)	(78,012)	(24,729)	100,902
Unrealized gains (losses) arising during the year, net of reclassification adjustment	239,114	349,886	(190,829)
Unrealized gains (losses) arising during the year for which an allowance for expected credit losses has not been recognized | Unrealized gains (losses) on available for sale investments
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the year	317,166	374,615	(291,731)
Unrealized gains (losses) arising during the year for which an allowance for expected credit losses has been recognized | Unrealized gains (losses) on available for sale investments
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the year	$ (40)	$ 0	$ 0

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