Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 275,186	$ 162,397
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Net loss on investments	1,703	5,208
Credit loss expense	56,942	37,849
Depreciation and amortization	41,476	57,134
Stock-based compensation expense	6,178	5,492
Other, net	11,579	(213)
Changes in assets and liabilities:
Accrued investment income	652	(1,858)
Premiums and other receivables	(118,214)	(172,669)
Deferred acquisition costs	(12,408)	(19,198)
Reinsurance recoverable	101,156	167,655
Prepaid reinsurance premiums	57,665	55,856
Prepaid expenses and other assets	20,688	93,691
Unpaid loss and loss adjustment expense reserves	(59,829)	(65,795)
Unearned premiums and other revenue	16,207	87,986
Reinsurance payable	(100,949)	(63,426)
Accounts payable and accrued expenses	6,371	(29,703)
Other liabilities	4,136	(25,202)
Net cash provided by operating activities	308,539	295,204
Cash flows from investing activities:
Purchases of debt securities, available-for-sale	(254,147)	(489,070)
Purchases of short-term investments	(590,546)	(1,237,248)
Purchases of other investments	(2,579)	(1,235)
Purchases of property and equipment	(18,455)	(77,749)
Proceeds from sale of debt securities, available-for-sale	41,410	41,619
Proceeds from maturities of debt securities, available-for-sale	268,952	131,491
Proceeds from sale of short-term investments	441,594	1,385,164
Proceeds from sale and return of other investments	21,964	7,599
Other investing activities	0	(5,935)
Net cash used in investing activities	(91,807)	(245,364)
Cash flows from financing activities:
Common stock repurchased	(8,482)	0
Payments of debt issuance costs	0	(1,726)
Repayments of debt and principal payments under capital leases obligations	(6,895)	(6,554)
Issuance of common stock — employee share options	836	247
Taxes paid related to net share settlement of equity awards	(3,491)	(3,140)
Dividends paid to common shareholders	(11,355)	(9,044)
Dividends paid to preferred shareholders	(16,800)	(16,742)
Net cash used in financing activities	(46,187)	(36,959)
Effect of exchange rate changes on cash and cash equivalents	0	(2,124)
Net increase in cash, cash equivalents, and restricted cash	170,545	10,757
Cash, cash equivalents, and restricted cash at beginning of the period	164,463	233,583
Cash, cash equivalents, and restricted cash at end of the period	335,008	244,340
Common stock
Dividends Payable
Dividends Payable	5,671	4,526
Preferred stock
Dividends Payable
Dividends Payable	$ 8,925	$ 8,925