Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities at fair value:
Equity securities (cost: 2018 - $3,721,932; 2017 - $3,170,673)	$ 4,545,899	$ 4,099,467
Debt securities (amortized cost: 2018 - $12,065,159; 2017 - $12,536,772)	12,066,223	12,721,399
Short-term investments	611,655	578,054
Marketable Securities, Total	17,223,777	17,398,920
Other invested assets	601,555	743,358
Total investments	18,489,265	18,800,642
Cash	711,040	838,375
Accrued investment income	97,998	105,877
Premium balances receivable	856,078	797,346
Reinsurance recoverables	1,653,758	1,746,488
Ceded unearned premiums	204,640	190,252
Deferred acquisition costs	467,524	453,346
Property and equipment at cost, net of accumulated depreciation and amortization	198,707	125,337
Goodwill	345,306	334,905
Intangible assets, net of amortization	467,475	459,037
Current taxes receivable	63,568	31,085
Net deferred tax assets	123,944	136,489
Funds held under reinsurance agreements	705,433	706,042
Other assets	712,520	659,096
Total assets	25,097,256	25,384,317
Liabilities, Redeemable Noncontrolling Interests and Stockholders' Equity
Loss and loss adjustment expenses	11,714,269	11,871,250
Unearned premiums	2,251,593	2,182,294
Senior Notes and other debt	1,540,865	1,484,897
Reinsurance payable	160,228	156,376
Other liabilities	919,270	1,068,907
Total liabilities	16,586,225	16,763,724
Redeemable noncontrolling interests	137,631	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	3,613,630	3,612,109
Accumulated other comprehensive (loss) income	(123,620)	618,118
Treasury stock, at cost (2018 - 2,097,820 shares; 2017 - 2,069,461 shares)	(843,497)	(824,906)
Retained earnings	5,709,427	5,091,282
Total stockholders' equity attributable to Alleghany stockholders	8,373,400	8,514,063
Total liabilities, redeemable noncontrolling interest and stockholders' equity	25,097,256	25,384,317
Commercial Mortgage Loan Portfolio
Securities at fair value:
Commercial mortgage loans	$ 663,933	$ 658,364