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Schedule II - Condensed Financial Information of Registrant - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	$ 2,886,505	$ 2,048,459	$ 1,559,322
Investing Activities:
Net (purchases) sales of short-term investments	(1,029,681)	39,833	485,473
Purchases of fixed assets	(39,872)	(37,837)	(29,809)
Other	(62,197)	(348,486)	21,736
Net cash provided by (used for) investing activities	(3,043,226)	(1,806,483)	(554,020)
Financing Activities:
Redemption of preferred shares	0	0	(92,555)
Proceeds from borrowings	1,018,793	200,083	218,259
Net Cash Provided by (Used in) Financing Activities	521,278	(80,662)	(988,810)
Increase (decrease) in cash and restricted cash	386,846	179,055	(2,641)
Cash and restricted cash, beginning of year	903,698	724,643	727,284
Cash and restricted cash, end of year	1,290,544	903,698	724,643
Parent
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	124,751	52,487	324,319
Investing Activities:
Net (purchases) sales of short-term investments	(130)	61	96,476
Capital contributed to subsidiaries	(988,975)	(2,121)	0
Purchases of fixed assets	(15)	(162)	(110)
Other	0	0	(4)
Net cash provided by (used for) investing activities	(989,120)	(2,222)	96,362
Financing Activities:
Purchases of common shares under share repurchase program	(83,472)	(2,871)	(282,762)
Proceeds from common shares issued, net	1,876	6,203	(7,608)
Redemption of preferred shares	0	0	(92,555)
Proceeds from borrowings	988,393	0	0
Preferred dividends paid	(41,612)	(41,612)	(41,645)
Net Cash Provided by (Used in) Financing Activities	865,185	(38,280)	(424,570)
Increase (decrease) in cash and restricted cash	816	11,985	(3,889)
Cash and restricted cash, beginning of year	18,144	6,159	10,048
Cash and restricted cash, end of year	$ 18,960	$ 18,144	$ 6,159

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