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Real Estate Joint Ventures (Details) (USD $)
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3 Months Ended | ||||||||||||||||||||
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Mar. 31, 2013
Property
Venture
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Mar. 31, 2012
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Dec. 31, 2012
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Investment Balance | $ (6,420,000) | $ (6,420,000) | |||||||||||||||||||
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Unconsolidated real estate joint ventures
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Number of unconsolidated real estate joint ventures in which the entity has an interest | 1 | ||||||||||||||||||||
| Investment Balance | (6,420,000) | [1] | (6,420,000) | [1] | |||||||||||||||||
| Ownership (as a percent) | 20.00% | ||||||||||||||||||||
| Number of buildings operated by the joint venture | 16 | ||||||||||||||||||||
| Maximum exposure to loss | 0 | [2] | |||||||||||||||||||
| Difference between carrying amount of investment and share of the equity in the joint venture | 4,000,000 | 4,500,000 | |||||||||||||||||||
| Condensed balance sheets for unconsolidated real estate joint venture | |||||||||||||||||||||
| Properties, net | 58,130,000 | 58,460,000 | |||||||||||||||||||
| Other assets | 5,120,000 | 4,376,000 | |||||||||||||||||||
| Total assets | 63,250,000 | 62,836,000 | |||||||||||||||||||
| Liabilities (primarily debt) | 75,417,000 | 72,693,000 | |||||||||||||||||||
| Owners' equity | (12,167,000) | (9,857,000) | |||||||||||||||||||
| Total liabilities and owners' equity | 63,250,000 | 62,836,000 | |||||||||||||||||||
| Condensed statements of operations for unconsolidated real estate joint venture | |||||||||||||||||||||
| Revenues | 1,792,000 | 1,894,000 | |||||||||||||||||||
| Property operating expenses | (786,000) | (737,000) | |||||||||||||||||||
| Interest expense | (2,774,000) | (1,125,000) | |||||||||||||||||||
| Depreciation and amortization expense | (542,000) | (570,000) | |||||||||||||||||||
| Net loss | (2,310,000) | (538,000) | |||||||||||||||||||
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Consolidated real estate joint ventures
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| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 206,341,000 | [3] | |||||||||||||||||||
| Pledged Assets | 105,674,000 | [3] | |||||||||||||||||||
| Total Liabilities | 86,920,000 | [3] | |||||||||||||||||||
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LW Redstone Company, LLC
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Ownership (as a percent) | 85.00% | ||||||||||||||||||||
| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 95,447,000 | [3],[4] | |||||||||||||||||||
| Pledged Assets | 23,199,000 | [3],[4] | |||||||||||||||||||
| Total Liabilities | 23,973,000 | [3],[4] | |||||||||||||||||||
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M Square Associates, LLC
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Ownership (as a percent) | 50.00% | ||||||||||||||||||||
| Number of buildings operated by the joint venture | 2 | [5] | |||||||||||||||||||
| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 61,059,000 | [3],[5] | |||||||||||||||||||
| Pledged Assets | 47,361,000 | [3],[5] | |||||||||||||||||||
| Total Liabilities | 42,675,000 | [3],[5] | |||||||||||||||||||
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Arundel Preserve 5, LLC
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Ownership (as a percent) | 50.00% | ||||||||||||||||||||
| Number of buildings operated by the joint venture | 1 | [6] | |||||||||||||||||||
| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 39,462,000 | [3],[6] | |||||||||||||||||||
| Pledged Assets | 35,114,000 | [3],[6] | |||||||||||||||||||
| Total Liabilities | 20,177,000 | [3],[6] | |||||||||||||||||||
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COPT-FD Indian Head, LLC
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Ownership (as a percent) | 75.00% | ||||||||||||||||||||
| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 6,447,000 | [3],[7] | |||||||||||||||||||
| Total Liabilities | 0 | [3],[7] | |||||||||||||||||||
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MOR Forbes 2 LLC
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| Investments in real estate joint ventures | |||||||||||||||||||||
| Ownership (as a percent) | 50.00% | ||||||||||||||||||||
| Number of buildings operated by the joint venture | 1 | [8] | |||||||||||||||||||
| Investments in consolidated real estate joint ventures | |||||||||||||||||||||
| Total Assets | 3,926,000 | [3],[8] | |||||||||||||||||||
| Total Liabilities | $ 95,000 | [3],[8] | |||||||||||||||||||
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