CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 223,083	$ 618,609	$ (120,424)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net investment (gains) losses	456,789	(134,279)	(129,133)
Net realized and unrealized gains on other investments	(55,757)	(180,329)	(16,059)
Amortization of fixed maturities	26,138	35,839	32,893
Interest in (income) loss of equity method investments	(1,995)	(32,084)	3,612
Amortization of value of business acquired	0	3,854	5,139
Other amortization and depreciation	68,288	66,977	65,797
Share-based compensation expense, net of cash payments	48,494	37,744	29,005
Changes in:
Accrued interest receivable	(30,432)	633	13,097
Reinsurance recoverable on unpaid losses and loss expenses	(825,608)	(527,362)	(618,040)
Reinsurance recoverable on paid losses and loss expenses	101,691	(207,429)	(105,820)
Deferred acquisition costs	(10,548)	(34,386)	60,828
Prepaid reinsurance premiums	(176,498)	(185,646)	(94,122)
Reserve for losses and loss expenses	544,459	737,342	1,178,292
Unearned premiums	287,082	409,858	62,999
Insurance and reinsurance balances, net	82,878	349,502	72,503
Other items	(45,848)	155,979	(97,064)
Net cash provided by operating activities	692,216	1,114,822	343,503
Purchases of:
Fixed maturities, available for sale	(7,476,440)	(12,133,755)	(10,494,198)
Fixed maturities, held to maturity	(255,610)	(196,775)	0
Equity securities	(94,324)	(137,247)	(117,883)
Mortgage loans	(117,023)	(145,832)	(199,259)
Other investments	(147,717)	(263,712)	(166,602)
Short-term investments	(176,968)	(159,056)	(365,170)
Proceeds from the sale of:
Fixed maturities, available for sale	6,110,148	9,203,241	9,784,137
Equity securities	138,542	24,862	119,381
Other investments	156,719	324,810	166,976
Short-term investments	116,752	177,672	171,976
Proceeds from redemption of fixed maturities, available for sale	1,018,922	1,817,482	1,526,396
Proceeds from redemption of fixed maturities, held to maturity	3,541	155,809	0
Proceeds from redemption of short-term investments	20,124	111,417	69,707
Proceeds from the repayment of mortgage loans	84,365	145,621	39,121
Purchase of other assets	(36,829)	(38,732)	(44,661)
Net cash provided by (used in) investing activities	(655,798)	(1,114,195)	489,921
Cash flows from financing activities:
Redemption of senior notes	0	0	(500,000)
Repurchase of preferred shares	0	0	(225,000)
Repurchase of common shares - open market	(34,987)		0
Taxes paid on withholding shares	(13,994)	(10,242)	(10,382)
Dividends paid - common shares	(149,341)	(145,603)	(141,590)
Dividends paid - preferred shares	(30,250)	(30,250)	(31,831)
Federal Home Loan Bank advances, net	78,950	0	0
Net cash used in financing activities	(149,622)	(186,095)	(908,803)
Effect of exchange rate changes on foreign currency cash, cash equivalents and restricted cash	(29,833)	(74)	2,154
Decrease in cash, cash equivalents and restricted cash	(143,037)	(185,542)	(73,225)
Cash, cash equivalents and restricted cash - beginning of year	1,317,690	1,503,232	1,576,457
Cash, cash equivalents and restricted cash - end of year	1,174,653	1,317,690	1,503,232
Supplemental disclosures of cash flow information:
Income taxes paid	33,418	45,083	4,414
Interest paid	$ 59,886	$ 59,400	$ 54,108