Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investments:
Equity securities	$ 3,580,228	$ 2,718,902
Debt securities	15,864,867	15,618,470
Short-term investments	379,009	714,208
Marketable Securities, Total	19,824,104	19,051,580
Commercial mortgage loans	543,106	670,239
Other invested assets	538,857	465,153
Total investments	20,906,067	20,186,972
Cash	871,459	791,442
Accrued investment income	86,249	88,760
Premium balances receivable	1,438,476	1,145,341
Reinsurance recoverables	1,873,447	1,781,096
Ceded unearned premiums	398,282	311,898
Deferred acquisition costs	651,832	595,117
Property and equipment at cost, net of accumulated depreciation and amortization	302,848	267,872
Goodwill	627,612	614,163
Intangible assets, net of amortization	801,666	787,462
Current taxes receivable	0	3,189
Funds held under reinsurance agreements	822,820	794,453
Other assets	1,710,903	1,559,245
Total assets	30,491,661	28,927,010
Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity
Loss and loss adjustment expenses	13,504,471	12,970,626
Unearned premiums	3,329,083	2,984,060
Senior notes and other debt	2,063,652	2,135,946
Reinsurance payable	294,229	208,384
Current taxes payable	6,166	0
Net deferred tax liabilities	88,329	43,547
Other liabilities	1,822,978	1,594,918
Total liabilities	21,108,908	19,937,481
Redeemable noncontrolling interests	240,722	233,809
Common stock	17,460	17,460
Contributed capital	3,612,783	3,613,454
Accumulated other comprehensive income	303,196	452,402
Treasury stock	(1,743,434)	(1,645,930)
Retained earnings	6,952,026	6,318,334
Total stockholders’ equity attributable to Alleghany stockholders	9,142,031	8,755,720
Total liabilities, redeemable noncontrolling interests and stockholders’ equity	$ 30,491,661	$ 28,927,010