Condensed Consolidated Balance Sheets (Unaudited) Statement - USD ($) $ in Thousands	Sep. 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 $5,391,584 and $5,393,623)	$ 5,580,212	$ 5,723,340
Trading securities—at fair value (amortized cost of $239,709 and $260,773)	263,363	290,885
Equity securities—at fair value (cost of $188,501 and $145,501)	193,498	151,240
Short-term investments—at fair value (includes $41,661 and $15,587 of reinvested cash collateral held under securities lending agreements)	617,515	618,004
Other invested assets—at fair value	3,899	4,973
Investments, Total	6,658,487	6,788,442
Cash	154,709	87,915
Restricted cash	1,866	6,231
Accrued investment income	33,258	34,047
Accounts and notes receivable	166,730	121,294
Reinsurance recoverables (includes $12 and $32 for paid losses)	76,048	73,202
Deferred policy acquisition costs	16,823	18,305
Property and equipment, net	74,170	80,457
Goodwill and other acquired intangible assets, net (Note 7)	20,456	23,043
Other assets (Note 9)	839,061	715,085
Assets, Total	8,041,608	7,948,021
Liabilities and Stockholders’ Equity
Unearned premiums	348,322	448,791
Reserve for losses and LAE (Note 11)	893,155	848,413
Senior notes (Note 12)	1,408,502	1,405,674
FHLB advances (Note 12)	172,649	176,483
Reinsurance funds withheld	290,502	278,555
Net deferred tax liability (Note 10)	286,957	213,897
Other Liabilities	383,585	291,855
Total liabilities	3,783,672	3,663,668
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at September 30, 2021 and December 31, 2020; 200,302 and 210,130 shares issued at September 30, 2021 and December 31, 2020, respectively; 181,336 and 191,606 shares outstanding at September 30, 2021 and December 31, 2020, respectively	200	210
Treasury stock, at cost: 18,966 and 18,524 shares at September 30, 2021 and December 31, 2020, respectively	(920,355)	(910,115)
Additional paid-in capital	2,012,870	2,245,897
Retained earnings	3,012,997	2,684,636
Accumulated other comprehensive income (loss) (Note 15)	152,224	263,725
Total stockholders’ equity	4,257,936	4,284,353
Total liabilities and stockholders’ equity	8,041,608	7,948,021
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	948
Fixed-maturities available for sale—at amortized cost	5,391,584	5,393,623
Debt Securities, Trading, Amortized Cost	239,709	260,773
Equity Securities, FV-NI, Cost	188,501	145,501
Reinvested Cash Collateral Held Under Securities Lending Agreements	41,661	15,587
Reinsurance Recoverables, Paid Losses	$ 12	$ 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	200,302,000	210,130,000
Common Stock, Shares, Outstanding	181,336,000	191,606,000
Treasury Stock, Shares	18,966,000	18,524,000