Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $16,146,333 and $14,829,902)	$ 16,470,523	$ 14,699,010
Short-term investments available for sale, at fair value (amortized cost: $752,207 and $956,238)	751,989	955,880
Collateral received under securities lending, at fair value (amortized cost: $430,255 and $274,125)	430,263	274,133
Equity securities, at fair value	550,485	338,899
Investments accounted for using the fair value option	3,838,243	3,983,571
Investments accounted for using the equity method	1,575,832	1,493,791
Total investments	23,617,335	21,745,284
Cash	880,099	646,556
Accrued investment income	116,196	114,641
Securities pledged under securities lending, at fair value (amortized cost: $419,297 and $266,786)	420,415	268,395
Premiums receivable	1,618,186	1,299,150
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	3,168,195	2,919,372
Contractholder receivables	2,094,683	2,079,111
Ceded unearned premiums	1,168,258	975,469
Deferred acquisition costs	622,028	569,574
Receivable for securities sold	50,615	36,246
Goodwill and intangible assets	624,500	634,920
Other assets	1,192,093	929,611
Total assets	35,572,603	32,218,329
Liabilities
Reserve for losses and loss adjustment expenses	12,389,384	11,853,297
Unearned premiums	4,243,372	3,753,636
Reinsurance balances payable	601,891	393,107
Contractholder payables	2,094,683	2,079,111
Collateral held for insured obligations	205,449	236,630
Senior notes	1,871,386	1,733,528
Revolving credit agreement borrowings	490,720	455,682
Securities lending payable	430,255	274,125
Payable for securities purchased	176,130	90,034
Other liabilities	1,007,524	911,500
Total liabilities	23,510,794	21,780,650
Commitments and Contingencies
Redeemable noncontrolling interests	48,789	206,292
Shareholders' Equity
Non-cumulative preferred shares	780,000	780,000
Common shares ($0.0011 par, shares issued: 574,173,205 and 570,737,283)	638	634
Additional paid-in capital	1,864,468	1,793,781
Retained earnings	10,705,025	9,426,299
Accumulated other comprehensive income (loss), net of deferred income tax	211,714	(178,720)
Common shares held in treasury, at cost (shares: 168,942,674 and 168,282,449)	(2,403,749)	(2,382,167)
Total shareholders' equity available to Arch	11,158,096	9,439,827
Non-redeemable noncontrolling interests	854,924	791,560
Total shareholders' equity	12,013,020	10,231,387
Total liabilities, noncontrolling interests and shareholders' equity	$ 35,572,603	$ 32,218,329