Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities at fair value:
Available for sale equity securities (cost: 2018 - $3,705,364; 2017 - $3,170,673)		$ 4,099,467
Equity securities (cost: 2018 - $3,705,364; 2017 - $3,170,673)	$ 4,714,079
Debt securities (amortized cost: 2018 - $12,206,035; 2017 - $12,536,772)	12,155,866	12,721,399
Short-term investments	472,830	578,054
Marketable Securities, Total	17,342,775	17,398,920
Other invested assets	605,477	743,358
Total investments	18,644,024	18,800,642
Cash	623,223	838,375
Accrued investment income	97,347	105,877
Premium balances receivable	831,989	797,346
Reinsurance recoverables	1,602,600	1,746,488
Ceded unearned premiums	208,534	190,252
Deferred acquisition costs	468,243	453,346
Property and equipment at cost, net of accumulated depreciation and amortization	197,678	125,337
Goodwill	346,270	334,905
Intangible assets, net of amortization	463,544	459,037
Current taxes receivable	68,396	31,085
Net deferred tax assets	61,806	136,489
Funds held under reinsurance agreements	719,360	706,042
Other assets	752,873	659,096
Total assets	25,085,887	25,384,317
Liabilities, Redeemable Noncontrolling Interests and Stockholders' Equity
Loss and loss adjustment expenses	11,515,493	11,871,250
Unearned premiums	2,279,810	2,182,294
Senior Notes and other debt	1,569,367	1,484,897
Reinsurance payable	159,944	156,376
Other liabilities	1,021,512	1,068,907
Total liabilities	16,546,126	16,763,724
Redeemable noncontrolling interests	135,372	106,530
Common stock (shares authorized: 2018 and 2017 - 22,000,000; shares issued: 2018 and 2017 - 17,459,961)	17,460	17,460
Contributed capital	3,612,615	3,612,109
Accumulated other comprehensive (loss) income	(172,307)	618,118
Treasury stock, at cost (2018 - 2,465,282 shares; 2017 - 2,069,461 shares)	(1,057,885)	(824,906)
Retained earnings	6,004,506	5,091,282
Total stockholders' equity attributable to Alleghany stockholders	8,404,389	8,514,063
Total liabilities, redeemable noncontrolling interest and stockholders' equity	25,085,887	25,384,317
Commercial Mortgage Loan Portfolio
Securities at fair value:
Commercial mortgage loans	$ 695,772	$ 658,364