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Real Estate Joint Ventures (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 21, 2016 USD ($) | Aug. 07, 2014 USD ($) | Jan. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) ft² buillding | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture |  |  |  | $ 22,600 | $ 0 | $ 0
Investing receivables |  |  |  | 52,279 | 47,875 |
Non-real estate equity method investments |  |  |  | 2,355 | 1,636 |
Notes receivable from City of Huntsville [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Amount of advanced |  |  |  | 37,200 |  |
Investing receivables |  |  |  | $ 49,258 | $ 44,875 |
Single-tenant data centers [Member] | Operating office properties [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture | $ 147,600 |  |  |  |  |
Ownership percentage sold (percent) | 50.00% |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |
Data Center Shells [Member] | Operating properties, net [Member] | Single-tenant data centers [Member] | Operating office properties [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Number of properties contributed | buillding |  |  |  | 6 |  |
LW Redstone Company, LLC [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Partner's capital account upon formation |  |  |  | $ 9,000 |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  |  |  | 85.00% |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners |  |  |  | 15.00% |  |
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value |  |  |  | 5 years |  |
Construction commencement threshold (in square feet) | ft² |  |  |  | 4,400,000.0 |  |
Construction commencement completed (in sqft) | ft² |  |  |  | 594,000 |  |
LW Redstone Company, LLC [Member] | Maximum [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) |  |  |  | $ 76,000 |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  |  |  | 85.00% |  |
Stevens Investors, LLC [Member] | Minimum [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  |  |  | 60.00% |  |
M Square Associates, LLC [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Percentage of residual amounts distributed to each member |  |  |  | 50.00% |  |
Consolidated real estate joint ventures [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Total Assets |  |  |  | $ 266,570 |  |
Encumbered Assets |  |  |  | 125,778 |  |
Total Liabilities |  |  |  | 104,166 |  |
GI-COPT [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Non-real estate equity method investments |  |  |  | 25,500 |  |
Difference between cost basis and share of underlying equity |  |  |  | $ 18,100 |  |
LW Redstone Company, LLC [Member] | Primary Beneficiary [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 85.00% |  |
Total Assets |  |  |  | $ 156,745 |  |
Encumbered Assets |  |  |  | 79,215 |  |
Total Liabilities |  |  |  | $ 51,207 |  |
M Square Associates, LLC [Member] | Primary Beneficiary [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 50.00% |  |
Total Assets |  |  |  | $ 68,900 |  |
Encumbered Assets |  |  |  | 46,563 |  |
Total Liabilities |  |  |  | $ 45,966 |  |
Stevens Investors, LLC [Member] | Primary Beneficiary [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Ownership (as a percent) |  |  |  | 95.00% |  |
Total Assets |  |  |  | $ 40,925 |  |
Encumbered Assets |  |  |  | 0 |  |
Total Liabilities |  |  |  | 6,993 |  |
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture |  |  | $ 22,600 |  |  |
Cash distribution |  |  | $ 13,400 |  |  |
Stevens Investors, LLC [Member] | Other Liabilities [Member] | Primary Beneficiary [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Due to affiliate |  |  |  | $ 6,700 |  |
COPT-FD Indian Head LLC [Member] | Primary Beneficiary [Member] |  |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |  |
Proceeds from real estate and real estate joint ventures |  | $ 6,400 |  |  |  |

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