Condensed Consolidated Balance Sheets (Unaudited) Statement - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
ASSETS
Fixed-maturities available for sale—at fair value (amortized cost $4,003,367 and $4,098,962)	$ 4,113,650	$ 4,021,575
Trading securities—at fair value (amortized cost of $319,021 and $468,696)	337,017	469,071
Equity securities—at fair value (cost of $148,635 and $139,377)	149,954	130,565
Short-term investments—at fair value (includes $20,862 and $11,699 of reinvested cash collateral held under securities lending agreements)	909,880	528,403
Other invested assets—at fair value	2,818	3,415
Total investments	5,513,319	5,153,029
Cash	74,111	95,393
Restricted cash	5,007	11,609
Accounts and notes receivable	122,104	78,652
Deferred income taxes, net (Note 9)	6,872	131,643
Goodwill and other acquired intangible assets, net (Note 6)	54,672	58,998
Prepaid reinsurance premium	385,805	417,628
Other assets (Note 8)	430,236	367,700
Total assets	6,592,126	6,314,652
Liabilities and Stockholders’ Equity
Unearned premiums	666,354	739,357
Reserve for losses and loss adjustment expense (Note 10)	405,278	401,361
Senior notes (Note 11)	982,890	1,030,348
FHLB advances (Note 11)	106,382	82,532
Reinsurance funds withheld	339,641	321,212
Other liabilities	308,337	251,127
Total liabilities	2,808,882	2,825,937
Commitments and contingencies (Note 12)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at June 30, 2019 and December 31, 2018; 223,312 and 231,132 shares issued at June 30, 2019 and December 31, 2018, respectively; 205,399 and 213,473 shares outstanding at June 30, 2019 and December 31, 2018, respectively	223	231
Treasury stock, at cost: 17,913 and 17,660 shares at June 30, 2019 and December 31, 2018, respectively	(901,419)	(894,870)
Additional paid-in capital	2,539,803	2,724,733
Retained earnings	2,056,175	1,719,541
Accumulated other comprehensive income (loss) (Note 14)	88,462	(60,920)
Total stockholders’ equity	3,783,244	3,488,715
Total liabilities and stockholders’ equity	$ 6,592,126	$ 6,314,652

Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580