Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale securities at fair value:
Equity securities (cost: 2017 - $1,816,796; 2016 - $2,816,572)	$ 2,215,477	$ 3,109,523
Debt securities (amortized cost: 2017 - $12,964,344; 2016 - $12,927,103)	13,052,529	12,983,213
Short-term investments	1,725,088	778,410
Marketable Securities, Total	16,993,094	16,871,146
Other invested assets	684,031	645,245
Total investments	18,296,806	18,111,269
Cash	624,445	594,091
Accrued investment income	107,438	113,763
Premium balances receivable	806,663	743,692
Reinsurance recoverables	1,259,584	1,272,219
Ceded unearned premiums	218,897	201,023
Deferred acquisition costs	455,122	448,634
Property and equipment at cost, net of accumulated depreciation and amortization	111,420	112,920
Goodwill	284,974	284,974
Intangible assets, net of amortization	374,915	378,680
Current taxes receivable	13,526	25,950
Net deferred tax assets	265,095	354,852
Funds held under reinsurance agreements	615,487	591,602
Other assets	504,769	522,922
Total assets	23,939,141	23,756,591
Liabilities, Redeemable Noncontrolling Interests and Stockholders' Equity
Loss and loss adjustment expenses	10,989,945	11,087,199
Unearned premiums	2,214,946	2,175,498
Senior Notes and other debt	1,471,183	1,476,489
Reinsurance payable	112,220	90,659
Other liabilities	892,526	912,081
Total liabilities	15,680,820	15,741,926
Redeemable noncontrolling interests	73,472	74,720
Common stock (shares authorized: 2017 and 2016 - 22,000,000; shares issued: 2017 and 2016 - 17,459,961)	17,460	17,460
Contributed capital	3,611,709	3,611,993
Accumulated other comprehensive income	202,185	109,284
Treasury stock, at cost (2017 - 2,041,950 shares; 2016 - 2,049,797 shares)	(809,729)	(812,840)
Retained earnings	5,163,224	5,014,048
Total stockholders' equity attributable to Alleghany stockholders	8,184,849	7,939,945
Total liabilities, redeemable noncontrolling interest and stockholders' equity	23,939,141	23,756,591
Commercial Mortgage Loan Portfolio
Available-for-sale securities at fair value:
Commercial mortgage loans	$ 619,681	$ 594,878