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Schedule II - Condensed Financial Information of Registrant - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	$ 3,427,555	$ 2,886,505	$ 2,048,459
Investing Activities:
Net (purchases) sales of short-term investments	165,272	(1,029,681)	39,833
Purchases of fixed assets	(41,394)	(39,872)	(37,837)
Net cash provided by (used for) investing activities	(2,139,732)	(3,043,226)	(1,806,483)
Financing Activities:
Purchases of common shares under share repurchase program	(1,234,294)	(83,472)	(2,871)
Proceeds from common shares issued, net	6,418	1,876	6,203
Proceeds from issuance of preferred shares, net	485,821	0	0
Redemption of preferred shares	(450,000)	0	0
Proceeds from borrowings	0	1,018,793	200,083
Preferred dividends paid	(48,280)	(41,612)	(41,612)
Net Cash Provided by (Used in) Financing Activities	(1,229,549)	521,278	(80,662)
Increase (decrease) in cash and restricted cash	24,227	386,846	179,055
Cash and restricted cash, beginning of year	1,290,544	903,698	724,643
Cash and restricted cash, end of year	1,314,771	1,290,544	903,698
Parent
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	1,727,529	124,751	52,487
Investing Activities:
Net (purchases) sales of short-term investments	(1,866)	(130)	61
Capital contributed to subsidiaries	(487,161)	(988,975)	(2,121)
Purchases of fixed assets	(783)	(15)	(162)
Net cash provided by (used for) investing activities	(489,810)	(989,120)	(2,222)
Financing Activities:
Purchases of common shares under share repurchase program	(1,234,294)	(83,472)	(2,871)
Proceeds from common shares issued, net	6,418	1,876	6,203
Proceeds from issuance of preferred shares, net	485,821	0	0
Redemption of preferred shares	(450,000)	0	0
Proceeds from borrowings	0	988,393	0
Preferred dividends paid	(48,280)	(41,612)	(41,612)
Net Cash Provided by (Used in) Financing Activities	(1,240,335)	865,185	(38,280)
Increase (decrease) in cash and restricted cash	(2,616)	816	11,985
Cash and restricted cash, beginning of year	18,960	18,144	6,159
Cash and restricted cash, end of year	$ 16,344	$ 18,960	$ 18,144

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