Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $16,757,086 and $16,598,808); net of allowance for credit losses: $9,909 at March 31, 2020)	$ 16,841,571	$ 16,894,526
Short-term investments available for sale, at fair value (amortized cost: $944,878 and $957,283); net of allowance for credit losses: $29 at March 31, 2020)	944,531	956,546
Collateral received under securities lending, at fair value (amortized cost: $182,274 and $388,366)	182,284	388,376
Equity securities, at fair value	1,181,903	838,925
Investments accounted for using the fair value option	3,310,517	3,663,477
Investments accounted for using the equity method	1,676,055	1,660,396
Total investments	24,136,861	24,402,246
Cash	882,284	726,230
Accrued investment income	118,089	117,937
Securities pledged under securities lending, at fair value (amortized cost: $175,218 and $378,738)	177,442	379,868
Premiums receivable (net of allowance for credit losses: $27,990 and $21,003)	2,155,204	1,778,717
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses (net of allowance for credit losses: $13,700 and $1,364)	4,303,135	4,346,816
Contractholder receivables (net of allowance for credit losses: $9,038 and $0)	2,140,724	2,119,460
Ceded unearned premiums	1,357,284	1,234,683
Deferred acquisition costs	708,848	633,400
Receivable for securities sold	221,573	24,133
Goodwill and intangible assets	705,450	738,083
Other assets	1,509,232	1,383,788
Total assets	38,416,126	37,885,361
Liabilities
Reserve for losses and loss adjustment expenses	14,309,580	13,891,842
Unearned premiums	4,817,191	4,339,549
Reinsurance balances payable	737,597	667,072
Contractholder payables	2,149,762	2,119,460
Collateral held for insured obligations	211,597	206,698
Senior notes	1,871,869	1,871,626
Revolving credit agreement borrowings	500,587	484,287
Securities lending payable	182,274	388,366
Payable for securities purchased	327,359	87,579
Other liabilities	1,392,905	1,513,330
Total liabilities	26,500,721	25,569,809
Commitments and Contingencies
Redeemable noncontrolling interests	55,376	55,404
Shareholders' Equity
Non-cumulative preferred shares	780,000	780,000
Common shares ($0.0011 par, shares issued: 577,386,799 and 574,617,195)	642	638
Additional paid-in capital	1,921,487	1,889,683
Retained earnings	11,132,268	11,021,006
Accumulated other comprehensive income (loss), net of deferred income tax	21,944	212,091
Common shares held in treasury, at cost (shares: 171,776,932 and 168,997,994)	(2,489,097)	(2,406,047)
Total shareholders' equity available to Arch	11,367,244	11,497,371
Non-redeemable noncontrolling interests	492,785	762,777
Total shareholders' equity	11,860,029	12,260,148
Total liabilities, noncontrolling interests and shareholders' equity	$ 38,416,126	$ 37,885,361