Condensed Consolidated Balance Sheets (Unaudited) Statement - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Fixed-maturities available for sale—at fair value (amortized cost $3,875,919 and $4,098,962)	$ 3,897,584	$ 4,021,575
Trading Securities—at fair value	383,992	469,071
Equity securities—at fair value (cost of $125,153 and $139,377)	125,025	130,565
Short-term investments—at fair value (includes $6,233 and $11,699 of reinvested cash collateral held under securities lending agreements)	1,066,110	528,403
Other invested assets—at fair value	3,059	3,415
Total investments	5,475,770	5,153,029
Cash	118,668	95,393
Restricted cash	9,086	11,609
Accounts and notes receivable	89,237	78,652
Deferred income taxes, net (Note 9)	67,697	131,643
Goodwill and other acquired intangible assets, net (Note 6)	56,811	58,998
Prepaid reinsurance premium	408,622	417,628
Other assets (Note 8)	373,678	367,700
Total assets	6,599,569	6,314,652
Liabilities and Stockholders’ Equity
Unearned premiums	720,159	739,357
Reserve for losses and loss adjustment expense (Note 10)	388,784	401,361
Senior notes (Note 11)	1,031,197	1,030,348
Reinsurance funds withheld	329,868	321,212
Other liabilities (Note 12)	419,470	333,659
Total liabilities	2,889,478	2,825,937
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at March 31, 2019 and December 31, 2018; 229,817 and 231,132 shares issued at March 31, 2019 and December 31, 2018, respectively; 212,136 and 213,473 shares outstanding at March 31, 2019 and December 31, 2018, respectively	230	231
Treasury stock, at cost: 17,681 and 17,660 shares at March 31, 2019 and December 31, 2018, respectively	(895,321)	(894,870)
Additional paid-in capital	2,697,724	2,724,733
Retained earnings	1,889,964	1,719,541
Accumulated other comprehensive income (loss) (Note 15)	17,494	(60,920)
Total stockholders’ equity	3,710,091	3,488,715
Total liabilities and stockholders’ equity	$ 6,599,569	$ 6,314,652