CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 13,630us-gaap_NetIncomeLoss	$ 20,448us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	46,418us-gaap_Depreciation	37,682us-gaap_Depreciation
Net amortization of debt discounts, premiums and deferred financing fees	29	(309)
Straight line rental income	187us-gaap_StraightLineRent	(5,977)us-gaap_StraightLineRent
Amortization of acquired real estate leases	10,304us-gaap_AmortizationOfIntangibleAssets	11,979us-gaap_AmortizationOfIntangibleAssets
Other amortization	7,346	4,231
Share-based compensation	3,958us-gaap_ShareBasedCompensation	3,354us-gaap_ShareBasedCompensation
Loss (reversal of loss) on asset impairment	1,904eqc_LossOnAssetImpairment	(4,473)eqc_LossOnAssetImpairment
Loss on early extinguishment of debt	428	0
Equity in earnings of investees	0	(10,934)
Gain on issuance of shares by an equity investee	0	(109)
Distributions of earnings from investees	0	10,120
Net gain on sale of properties	(5,868)	0
Other non-cash expenses	0us-gaap_OtherNoncashExpense	7,142us-gaap_OtherNoncashExpense
Change in assets and liabilities:
Restricted cash	2,366	5,362
Rents receivable and other assets	(28,678)	(18,250)
Accounts payable and accrued expenses	(11,134)	(12,545)
Rent collected in advance	(620)	(1,125)
Security deposits	51	204
Due to related persons	0	(173)
Cash provided by operating activities	40,321	46,627
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate improvements	(12,163)eqc_CashPaidForRealEstateImprovements	(38,457)eqc_CashPaidForRealEstateImprovements
Principal payments received from direct financing lease	1,883	1,795
Proceeds from sale of properties, net	19,841	0
Proceeds from sale of securities	27,068	0
Increase in restricted cash	(3,458)	(141)
Cash provided by (used in) investing activities	33,171	(36,803)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on borrowings	(1,589)us-gaap_RepaymentsOfLongTermDebt	(14,066)us-gaap_RepaymentsOfLongTermDebt
Deferred financing fees	(7,143)us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts
Distributions to common shareholders	0us-gaap_PaymentsOfDividendsCommonStock	(29,597)us-gaap_PaymentsOfDividendsCommonStock
Distributions to preferred shareholders	(6,981)	(11,151)
Cash used in financing activities	(15,713)	(54,814)
Effect of exchange rate changes on cash	(559)	657
Increase (decrease) in cash and cash equivalents	57,220	(44,333)
Cash and cash equivalents at beginning of period	364,516	217,032
Cash and cash equivalents at end of period	421,736	172,699
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	33,479us-gaap_InterestPaid	43,228us-gaap_InterestPaid
Taxes paid	2,251us-gaap_IncomeTaxesPaid	2,321us-gaap_IncomeTaxesPaid
NON-CASH INVESTING ACTIVITIES:
Increase in capital expenditures recorded as liabilities	$ 1,139	$ 10,627

Cash paid for improvements made to real estate investments during the period.

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This element represents the gain (loss) included in earnings related to continuing and discontinued properties resulting from the sale of a business component. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net change during the reporting period in rent receivables and other operating assets which is not otherwise defined in the taxonomy.

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The charge against earnings resulting from the aggregate write down of continued and discontinued assets from their carrying value to their fair value.

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Represents the cash inflow received by the entity during the reporting period from repayments of principal related to direct financing lease.

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This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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Change during the period in carrying value for all deferred liabilities due within one year or operating cycle.

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The increase (decrease) in obligations owed to an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) during the reporting period in security deposits.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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