Condensed Consolidated Balance Sheets (Unaudited) Statement - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Fixed-maturities available for sale—at fair value, net of allowance for credit losses of $0 and $948 (amortized cost of $5,349,405 and $5,393,623)	$ 5,572,813	$ 5,723,340
Trading securities—at fair value (amortized cost of $241,657 and $260,773)	267,980	290,885
Equity securities—at fair value (cost of $160,224 and $145,501)	175,147	151,240
Short-term investments—at fair value (includes $32,435 and $15,587 of reinvested cash collateral held under securities lending agreements)	662,095	618,004
Other invested assets—at fair value	3,624	4,973
Investments, Total	6,681,659	6,788,442
Cash	134,939	87,915
Restricted cash	2,968	6,231
Accrued investment income	32,223	34,047
Accounts and notes receivable	153,128	121,294
Reinsurance recoverables	75,411	73,202
Deferred policy acquisition costs	17,873	18,305
Property and equipment, net	74,288	80,457
Goodwill and other acquired intangible assets, net (Note 7)	21,318	23,043
Other assets (Note 9)	815,261	715,085
Assets, Total	8,009,068	7,948,021
Liabilities and Stockholders’ Equity
Unearned premiums	373,031	448,791
Reserve for losses and LAE (Note 11)	885,498	848,413
Senior notes (Note 12)	1,407,545	1,405,674
FHLB advances (Note 12)	153,983	176,483
Reinsurance funds withheld	285,406	278,555
Net deferred tax liability (Note 10)	266,330	213,897
Other Liabilities	303,442	291,855
Total liabilities	3,675,235	3,663,668
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at June 30, 2021 and December 31, 2020; 207,250 and 210,130 shares issued at June 30, 2021 and December 31, 2020, respectively; 188,290 and 191,606 shares outstanding at June 30, 2021 and December 31, 2020, respectively	207	210
Treasury stock, at cost: 18,960 and 18,524 shares at June 30, 2021 and December 31, 2020, respectively	(920,225)	(910,115)
Additional paid-in capital	2,161,857	2,245,897
Retained earnings	2,913,138	2,684,636
Accumulated other comprehensive income (loss) (Note 15)	178,856	263,725
Total stockholders’ equity	4,333,833	4,284,353
Total liabilities and stockholders’ equity	8,009,068	7,948,021
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	948
Fixed-maturities available for sale—at amortized cost	5,349,405	5,393,623
Debt Securities, Trading, Amortized Cost	241,657	260,773
Equity Securities, FV-NI, Cost	160,224	145,501
Reinvested Cash Collateral Held Under Securities Lending Agreements	32,435	15,587
Reinsurance Recoverables, Paid Losses	$ 7	$ 32
Parent Company
Stockholders’ equity
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	485,000,000	485,000,000
Common Stock, Shares, Issued	207,250,000	210,130,000
Common Stock, Shares, Outstanding	188,290,000	191,606,000
Treasury Stock, Shares	18,960,000	18,524,000