CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 194,071	$ 395,459
Adjustments to reconcile net income to net cash provided by operating activities:
Net investment (gains) losses	30,005	9,207
Net realized and unrealized gains on other investments	(22,410)	(4,973)
Amortization of fixed maturities	(10,621)	(8,630)
Interest in income of equity method investments	(2,291)	(1,169)
Other amortization and depreciation	13,792	14,257
Share-based compensation expense	11,829	13,670
Changes in:
Accrued interest receivable	5,503	(1,411)
Reinsurance recoverable on unpaid losses and loss expenses	(106,132)	(186,791)
Reinsurance recoverable on paid losses and loss expenses	1,064	98,362
Deferred acquisition costs	(103,121)	(94,737)
Prepaid reinsurance premiums	(240,695)	(144,311)
Reserve for losses and loss expenses	278,614	209,390
Unearned premiums	653,052	611,974
Insurance and reinsurance balances, net	(326,816)	(267,456)
Other items	(66,765)	(258,702)
Net cash provided by operating activities	309,079	384,139
Purchases of:
Fixed maturities, available for sale	(2,946,681)	(2,450,714)
Fixed maturities, held to maturity	(9,950)	(46,534)
Equity securities	(73,063)	(76,270)
Mortgage loans	(72)	(1,552)
Other investments	(20,729)	(18,368)
Equity method investments	(4,955)	(6,791)
Short-term investments	(196,153)	(82,199)
Proceeds from the sale of:
Fixed maturities, available for sale	2,872,156	2,367,906
Equity securities	82,625	97,434
Other investments	34,855	38,027
Short-term investments	228,673	19,325
Proceeds from redemption of fixed maturities, available for sale	369,666	435,700
Proceeds from redemption of fixed maturities, held to maturity	63,780	39,791
Proceeds from redemption of short-term investments	102,524	4,510
Proceeds from the repayment of mortgage loans	35,579	211
Proceeds from the purchase of other asset, net	(7,273)	(8,208)
Loan advances made	(68,696)	(101,229)
Net cash provided by investing activities	462,286	211,039
Cash flows from financing activities:
Repurchase of common shares - open market	(439,992)	(61,607)
Taxes paid on withholding shares	(24,514)	(14,121)
Dividends paid - common shares	(39,590)	(40,208)
Dividends paid - preferred shares	(7,563)	(7,563)
Net cash used in financing activities	(511,659)	(123,499)
Effect of exchange rate changes on foreign currency cash, cash equivalents and restricted cash	9,440	(14,090)
Increase in cash, cash equivalents and restricted cash	269,146	457,589
Cash, cash equivalents and restricted cash - beginning of period	3,063,621	1,383,985	$ 1,383,985
Cash, cash equivalents and restricted cash - end of period	3,332,767	1,841,574	$ 3,063,621
Supplemental disclosures of cash flow information:
Income taxes paid	12,770	6,796
Interest paid	$ 17,099	$ 17,504