CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 324,227	$ 230,812
Adjustments to reconcile net income to net cash used in operating activities:
Net investment (gains) losses	(48,522)	71,799
Net realized and unrealized gains on other investments	(49,271)	(41,924)
Amortization of fixed maturities	13,616	20,547
Interest in income of equity method investments	(5,645)	(3,557)
Amortization of value of business acquired	24,666	149,535
Other amortization and depreciation	56,964	32,934
Share-based compensation expense, net of cash payments	21,160	26,145
Changes in:
Accrued interest receivable	(1,291)	1,085
Reinsurance recoverable balances on unpaid and paid losses	(165,247)	(419,226)
Deferred acquisition costs	(20,249)	(214,500)
Prepaid reinsurance premiums	(228,973)	(311,498)
Reserve for losses and loss expenses	216,086	179,018
Unearned premiums	517,798	632,912
Insurance and reinsurance balances, net	(377,826)	(290,728)
Other items	(35,978)	67,813
Net cash provided by operating activities	241,515	131,167
Cash flows from investing activities:
Fixed maturities	(7,705,671)	(6,707,576)
Equity securities	(45,086)	(59,040)
Mortgage loans	(129,711)	(78,079)
Other investments	(166,728)	(79,319)
Short-term investments	(126,960)	(285,103)
Proceeds from the sale of:
Fixed maturities	6,022,475	5,956,644
Equity securities	32,682	223,098
Other investments	222,982	211,395
Short-term investments	243,293	153,687
Proceeds from redemption of fixed maturities	885,128	982,010
Proceeds from redemption of short-term investments	15,794	37,831
Proceeds from the repayment of mortgage loans	20,759	70,481
Purchase of other assets	(41,800)	(16,918)
Net cash provided by (used in) investing activities	(772,843)	409,111
Cash flows from financing activities:
Taxes paid on withholding shares	(9,445)	(8,699)
Dividends paid - common shares	(103,526)	(100,770)
Dividends paid - preferred shares	(31,969)	(31,969)
Net proceeds from issuance of senior notes	296,334	0
Redemption of senior notes	(250,000)	0
Net cash used in financing activities	(98,606)	(141,438)
Effect of exchange rate changes on foreign currency cash, cash equivalents, and restricted cash	8,465	(10,228)
Increase (decrease) in cash, cash equivalents, and restricted cash	(621,469)	388,612
Cash, cash equivalents, and restricted cash - beginning of period	1,830,020	1,363,786
Cash, cash equivalents, and restricted cash - end of period	1,208,551	1,752,398
Supplemental disclosures of cash flow information:
Income taxes paid	12,149	12,108
Interest paid	$ 37,875	$ 42,856