Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $16,733,493 and $16,598,808; net of allowance for credit losses: $5,869 at June 30, 2020)	$ 17,207,731	$ 16,894,526
Short-term investments available for sale, at fair value (amortized cost: $2,276,413 and $957,283; net of allowance for credit losses: $0 at June 30, 2020)	2,277,866	956,546
Collateral received under securities lending, at fair value (amortized cost: $473,783 and $388,366)	473,790	388,376
Equity securities, at fair value	1,257,317	838,925
Investments accounted for using the fair value option	3,520,771	3,663,477
Investments accounted for using the equity method	1,727,302	1,660,396
Total investments	26,464,777	24,402,246
Cash	854,259	726,230
Accrued investment income	102,064	117,937
Securities pledged under securities lending, at fair value (amortized cost: $460,760 and $378,738)	464,503	379,868
Premiums receivable (net of allowance for credit losses: $36,054 and $21,003)	2,203,753	1,778,717
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses (net of allowance for credit losses: $13,595 and $1,364)	4,363,507	4,346,816
Contractholder receivables (net of allowance for credit losses: $6,290 and $0)	2,179,124	2,119,460
Ceded unearned premiums	1,364,603	1,234,683
Deferred acquisition costs	714,531	633,400
Receivable for securities sold	167,281	24,133
Goodwill and intangible assets	688,490	738,083
Other assets	1,632,756	1,383,788
Total assets	41,199,648	37,885,361
Liabilities
Reserve for losses and loss adjustment expenses	15,044,874	13,891,842
Unearned premiums	4,827,445	4,339,549
Reinsurance balances payable	793,467	667,072
Contractholder payables	2,185,414	2,119,460
Collateral held for insured obligations	208,449	206,698
Senior notes	2,860,733	1,871,626
Revolving credit agreement borrowings	335,587	484,287
Securities lending payable	473,783	388,366
Payable for securities purchased	275,257	87,579
Other liabilities	1,467,739	1,513,330
Total liabilities	28,472,748	25,569,809
Commitments and Contingencies
Redeemable noncontrolling interests	55,986	55,404
Shareholders' Equity
Non-cumulative preferred shares	780,000	780,000
Common shares ($0.0011 par, shares issued: 577,956,232 and 574,617,195)	642	638
Additional paid-in capital	1,935,514	1,889,683
Retained earnings	11,420,686	11,021,006
Accumulated other comprehensive income (loss), net of deferred income tax	349,488	212,091
Common shares held in treasury, at cost (shares: 171,985,981 and 168,997,994)	(2,494,505)	(2,406,047)
Total shareholders' equity available to Arch	11,991,825	11,497,371
Non-redeemable noncontrolling interests	679,089	762,777
Total shareholders' equity	12,670,914	12,260,148
Total liabilities, noncontrolling interests and shareholders' equity	$ 41,199,648	$ 37,885,361