CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 12,060us-gaap_ProfitLoss	$ 8,118us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,816	17,882
Amortization of above/below market leases	(128)us-gaap_AmortizationOfIntangibleAssets	(70)us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred financing costs	294us-gaap_AmortizationOfFinancingCosts	580us-gaap_AmortizationOfFinancingCosts
Gain on land disposal	(36)cor_GainOnLandDisposal
Share-based compensation	1,569us-gaap_ShareBasedCompensation	1,716us-gaap_ShareBasedCompensation
Bad debt expense	78us-gaap_ProvisionForDoubtfulAccounts	285us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities:
Accounts receivable	(503)	(400)
Deferred rent receivable	(581)us-gaap_StraightLineRent	(473)us-gaap_StraightLineRent
Deferred leasing costs	(3,779)	(800)
Other assets	(1,963)	(1,006)
Accounts payable and accrued expenses	(459)	(2,988)
Unearned revenue , prepaid rent and other liabilities	1,614	3,982
Deferred rent payable	(234)	(117)
Net cash provided by operating activities	30,748	26,709
CASH FLOWS FROM INVESTING ACTIVITIES
Tenant improvements	(1,852)us-gaap_PaymentsForTenantImprovements	(2,300)us-gaap_PaymentsForTenantImprovements
Real estate improvements	(23,660)	(27,747)
Deduction- cost of land disposal	2,410us-gaap_RealEstateCostOfRealEstateSold
Net cash used in investing activities	(23,102)	(30,047)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	449	214
Proceeds from revolving credit facility	15,250	26,750
Payments on revolving credit facility		(41,000)
Proceeds from senior unsecured term loan		100,000
Repayments of mortgage loans payable		(58,250)us-gaap_RepaymentsOfLongTermDebt
Contributions		(997)
Dividends and distributions	(21,949)us-gaap_PaymentsOfDividends	(18,539)us-gaap_PaymentsOfDividends
Net cash provided by financing activities	(6,250)	8,178
Net change in cash and cash equivalents	1,396	4,840
Cash and cash equivalents, beginning of period	10,662	5,313
Cash and cash equivalents, end of period	12,058	10,662
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest, net of capitalized amounts	1,103us-gaap_InterestPaidNet	756us-gaap_InterestPaidNet
NON-CASH INVESTING AND FINANCING ACTIVITY
Construction costs payable capitalized to real estate	17,419	14,965
Dividends Payable	$ 22,374	$ 18,686

Represents the gain on land sales.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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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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Future cash outflow to pay for construction in progress expenditures that have occurred.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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