Condensed Consolidated Balance Sheets (Unaudited) Statement - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Fixed-maturities available for sale—at fair value (amortized cost of $4,564,616 and $4,549,534)	$ 4,603,613	$ 4,688,911
Trading securities—at fair value (amortized cost of $270,551 and $297,505)	287,270	317,150
Equity securities—at fair value (cost of $86,456 and $125,311)	74,853	130,221
Short-term investments—at fair value (includes $14,808 and $25,561 of reinvested cash collateral held under securities lending agreements)	638,760	518,393
Other invested assets—at fair value	4,131	4,072
Total investments	5,608,627	5,658,747
Cash	54,108	92,729
Restricted cash	7,817	3,545
Accounts and notes receivable	123,381	93,630
Goodwill and other acquired intangible assets, net (Note 6)	27,208	28,187
Prepaid reinsurance premium	356,104	363,856
Other assets (Note 8)	513,187	567,619
Total assets	6,690,432	6,808,313
Liabilities and Stockholders’ Equity
Unearned premiums	605,045	626,822
Reserve for losses and loss adjustment expense (Note 10)	418,202	404,765
Senior notes (Note 11)	887,584	887,110
FHLB advances (Note 11)	173,760	134,875
Reinsurance funds withheld	302,551	291,829
Other liabilities	438,782	414,189
Total liabilities	2,825,924	2,759,590
Commitments and contingencies (Note 12)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at March 31, 2020 and December 31, 2019; 208,364 and 219,123 shares issued at March 31, 2020 and December 31, 2019, respectively; 190,387 and 201,164 shares outstanding at March 31, 2020 and December 31, 2019, respectively	208	219
Treasury stock, at cost: 17,977 and 17,959 shares at March 31, 2020 and December 31, 2019, respectively	(902,024)	(901,657)
Additional paid-in capital	2,231,670	2,449,884
Retained earnings	2,504,853	2,389,789
Accumulated other comprehensive income (loss) (Note 14)	29,801	110,488
Total stockholders’ equity	3,864,508	4,048,723
Total liabilities and stockholders’ equity	$ 6,690,432	$ 6,808,313