Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Real estate assets
Land	$ 282,431us-gaap_Land	$ 261,777us-gaap_Land
Buildings and improvements	1,422,288	1,346,870
Furniture and fixtures	43,470us-gaap_FurnitureAndFixturesGross	41,609us-gaap_FurnitureAndFixturesGross
Construction in progress	75,826us-gaap_ConstructionInProgressGross	73,581us-gaap_ConstructionInProgressGross
Gross real estate	1,824,015	1,723,837
Less: Accumulated depreciation	(404,491)	(397,210)
Real estate held for sale, net of accumulated depreciation of $7,444	6,209us-gaap_RealEstateHeldforsale	0us-gaap_RealEstateHeldforsale
Net real estate owned	1,425,733aec_Netrealestateowned	1,326,627aec_Netrealestateowned
Investment in unconsolidated entities	55,084	54,800
Total net real estate	1,480,817us-gaap_RealEstateInvestmentPropertyNet	1,381,427us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	6,952	4,692
Restricted cash	4,148	46,361
Accounts receivable, net
Rents	1,030us-gaap_AccountsReceivableNet	1,093us-gaap_AccountsReceivableNet
Other	3,775us-gaap_OtherReceivables	2,977us-gaap_OtherReceivables
Other assets, net	29,793us-gaap_OtherAssets	29,147us-gaap_OtherAssets
Total assets	1,526,515us-gaap_Assets	1,465,697us-gaap_Assets
LIABILITIES AND EQUITY
Mortgage notes payable	282,587us-gaap_SecuredDebt	272,613us-gaap_SecuredDebt
Unsecured notes	250,000us-gaap_SeniorNotes	250,000us-gaap_SeniorNotes
Unsecured revolving credit facility	144,000us-gaap_LineOfCredit	76,500us-gaap_LineOfCredit
Unsecured term loan	150,000us-gaap_UnsecuredDebt	150,000us-gaap_UnsecuredDebt
Total debt	826,587us-gaap_LongTermDebt	749,113us-gaap_LongTermDebt
Accounts payable and other liabilities	40,747	47,070
Dividends payable	13,053	12,886
Resident security deposits	4,010us-gaap_SecurityDepositLiability	3,860us-gaap_SecurityDepositLiability
Accrued interest	4,852	5,192
Total liabilities	889,249us-gaap_Liabilities	818,121us-gaap_Liabilities
Equity
Common shares, without par value; $.10 stated value; 91,000,000 authorized; 57,929,535 issued and 57,885,841 outstanding at March 31, 2015 and 57,708,675 issued and 57,649,609 outstanding at December 31, 2014, respectively	5,793us-gaap_CommonStockValue	5,771us-gaap_CommonStockValue
Paid-in capital	759,526us-gaap_AdditionalPaidInCapital	758,079us-gaap_AdditionalPaidInCapital
Accumulated distributions in excess of accumulated net income	(126,084)	(114,551)
Accumulated other comprehensive loss	(1,229)	(1,093)
Less: Treasury shares, at cost, 43,694 and 56,066 shares at March 31, 2015 and December 31, 2014, respectively	(1,090)us-gaap_TreasuryStockValue	(980)us-gaap_TreasuryStockValue
Total shareholders' equity attributable to AERC	636,916us-gaap_StockholdersEquity	647,226us-gaap_StockholdersEquity
Noncontrolling interest	350us-gaap_MinorityInterest	350us-gaap_MinorityInterest
Total equity	637,266	647,576
Total liabilities and equity	$ 1,526,515	$ 1,465,697

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Sum of the carrying values as of the balance sheet date of liabilities incurred and payable to vendors for goods and services received, and other costs not separately disclosed in the balance sheet that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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