Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $13,626,639 and $13,522,671)	$ 13,671,011	$ 13,426,577
Short-term investments available for sale, at fair value (amortized cost: $914,032 and $611,878)	914,356	612,005
Collateral received under securities lending, at fair value (amortized cost: $627,852 and $762,554)	627,843	762,565
Equity securities available for sale, at fair value (cost: $389,745 and $475,085)	461,017	518,041
Other investments available for sale, at fair value (cost: $208,941 and $149,077)	248,661	167,970
Investments accounted for using the fair value option	3,827,408	3,421,220
Investments accounted for using the equity method	948,856	811,273
Total investments	20,699,152	19,719,651
Cash	740,320	842,942
Accrued investment income	108,562	124,483
Securities pledged under securities lending, at fair value (amortized cost: $610,355 and $746,409)	610,121	744,980
Premiums receivable	1,314,564	1,072,435
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	2,155,107	2,114,138
Contractholder receivables	1,826,966	1,717,436
Ceded unearned premiums	961,330	859,567
Deferred acquisition costs	506,748	447,560
Receivable for securities sold	212,512	58,284
Goodwill and intangible assets	712,975	781,553
Other assets	1,014,282	889,080
Total assets	30,862,639	29,372,109
Liabilities
Reserve for losses and loss adjustment expenses	10,520,511	10,200,960
Unearned premiums	3,679,651	3,406,870
Reinsurance balances payable	361,000	300,407
Contractholder payables	1,826,966	1,717,436
Collateral held for insured obligations	338,737	301,406
Senior notes	1,732,570	1,732,258
Revolving credit agreement borrowings	686,452	756,650
Securities lending payable	627,852	762,554
Payable for securities purchased	458,722	76,183
Other liabilities	648,099	806,260
Total liabilities	20,880,560	20,060,984
Commitments and Contingencies
Redeemable noncontrolling interests	205,736	205,553
Shareholders' Equity
Non-cumulative preferred shares	772,555	772,555
Convertible non-voting common equivalent preferred shares	489,627	1,101,304
Common shares ($0.0033 par, shares issued: 182,714,362 and 174,644,101)	609	582
Additional paid-in capital	1,196,884	531,687
Retained earnings	8,412,114	7,996,701
Accumulated other comprehensive income (loss), net of deferred income tax	78,441	(114,541)
Common shares held in treasury, at cost (shares: 52,034,403 and 51,856,584)	(2,051,343)	(2,034,570)
Total shareholders' equity available to Arch	8,898,887	8,253,718
Non-redeemable noncontrolling interests	877,456	851,854
Total shareholders' equity	9,776,343	9,105,572
Total liabilities, noncontrolling interests and shareholders' equity	$ 30,862,639	$ 29,372,109