Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities
Net income	$ 56,330	$ 109,270
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	12,807	13,703
Stock-based compensation expense	7,031	6,493
Undistributed gains of equity method investments	(9,406)	(13,905)
Distributions in excess of current year income of equity method investments	11,626	2,309
Net realized and unrealized losses (gains)	40,352	(5,119)
Loss on disposal of fixed assets	2	3
Changes in assets and liabilities:
Increase in reserve for loss and loss expense, net of reinsurance recoverable	86,197	106,468
Increase in unearned premiums, net of prepaid reinsurance	77,515	73,218
Increase in net federal income taxes	13,656	25,927
Increase in premiums receivable	(66,346)	(59,182)
Increase in deferred policy acquisition costs	(14,774)	(14,074)
Increase in accrued investment income	(185)	(1,101)
Decrease in accrued salaries and benefits	(30,473)	(31,216)
Increase in other assets	(10,789)	(14,302)
Decrease in other liabilities	(80,864)	(68,236)
Net Cash Provided by Operating Activities	92,679	130,256
Investing Activities
Purchase of fixed income securities, held-to-maturity	(5,000)	(9,000)
Purchase of fixed income securities, available-for-sale	(874,665)	(671,909)
Purchase of commercial mortgage loans	(20,399)	(14,860)
Purchase of equity securities	13,952	48,910
Purchase of other investments	(15,555)	(18,589)
Purchase of short-term investments	(910,191)	(1,723,212)
Sale of fixed income securities, available-for-sale	425,234	212,891
Proceeds from commercial mortgage loans	301	99
Sale of short-term investments	1,101,725	1,795,239
Redemption and maturities of fixed income securities, held-to-maturity	756	1,461
Redemption and maturities of fixed income securities, available-for-sale	216,024	319,469
Sale of equity securities	2,626	42,782
Sale of other investments	525	3,004
Distributions from other investments	4,342	5,162
Purchase of property and equipment	(7,677)	(4,561)
Net Cash Used in Investing Activities	(95,906)	(110,934)
Financing Activities
Dividends to preferred stockholders	(2,300)	(2,453)
Dividends to common stockholders	(16,447)	(14,569)
Acquisition of treasury stock	(5,592)	(8,845)
Net proceeds from stock purchase and compensation plans	999	824
Preferred stock issued, net of issuance costs	0	(479)
Repayments of finance lease obligations	(612)	(115)
Net Cash used in Financing Activities	(23,952)	(25,637)
Cash and restricted cash, beginning of year	45,063	15,231
Cash and restricted cash, end of period	17,884	8,916
Net decrease in cash and restricted cash	$ (27,179)	$ (6,315)