Consolidated Balance Sheets Statement - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Fixed-maturities available for sale—at fair value, net of allowance for credit losses of $948 as of December 31, 2020 (amortized cost of $5,393,623 and $4,549,534)	$ 5,723,340	$ 4,688,911
Trading securities—at fair value (amortized cost of $260,773 and $297,505)	290,885	317,150
Equity securities—at fair value (cost of $145,501 and $125,311)	151,240	130,221
Short-term investments—at fair value (includes $15,587 and $25,561 of reinvested cash collateral held under securities lending agreements)	618,004	518,393
Other invested assets—at fair value	4,973	4,072
Total investments	6,788,442	5,658,747
Cash	87,915	92,729
Restricted cash	6,231	3,545
Accrued investment income	34,047	32,333
Accounts and notes receivable	121,294	93,630
Reinsurance recoverables	73,202	16,976
Deferred policy acquisition costs	18,305	20,759
Property and equipment	80,457	87,879
Prepaid reinsurance premium	267,638	363,856
Goodwill and other acquired intangible assets, net (Note 7)	23,043	28,187
Other assets (Note 9)	447,447	409,672
Total assets	7,948,021	6,808,313
Liabilities and Stockholders’ Equity
Unearned premiums	448,791	626,822
Reserve for losses and LAE (Note 11)	848,413	404,765
Senior notes (Note 12)	1,405,674	887,110
FHLB advances (Note 12)	176,483	134,875
Reinsurance funds withheld	278,555	291,829
Net deferred tax liability (Note 10)	213,897	71,084
Other liabilities	291,855	343,105
Total liabilities	3,663,668	2,759,590
Commitments and Contingencies (Note 13)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at December 31, 2020 and 2019; 210,130 and 219,123 shares issued at December 31, 2020 and 2019, respectively; 191,606 and 201,164 shares outstanding at December 31, 2020 and 2019, respectively	210	219
Treasury stock, at cost: 18,524 and 17,959 shares at December 31, 2020 and 2019, respectively	(910,115)	(901,657)
Additional paid-in capital	2,245,897	2,449,884
Retained earnings	2,684,636	2,389,789
Accumulated other comprehensive income (loss) (Note 15)	263,725	110,488
Total stockholders’ equity	4,284,353	4,048,723
Total liabilities and stockholders’ equity	7,948,021	6,808,313
Reinvested Cash Collateral Held Under Securities Lending Agreements	15,587	25,561
Fixed-maturities available for sale—amortized cost	5,393,623	$ 4,549,534
Allowance for Credit Losses	$ (948)