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Summary of Significant Accounting Policies (Details 4) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture | $ 39,845 |  |  |  | $ 41,787 |  |  |  | $ 39,845 | $ 41,787 | $ 43,661
Cumulative distributions in excess of net income | (846,808) |  |  |  | (802,085) |  |  |  | (846,808) | (802,085) | (747,825)
Noncontrolling interests in subsidiaries | 41,637 |  |  |  | 66,165 |  |  |  | 41,637 | 66,165 | 72,267
Gain on sales of real estate |  |  |  |  |  |  |  |  | 2,340 | 9,890 | 59,679
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  | 75,583 | 74,549 | 33,260
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 2,697 | 1,490 | 752
Net income | 18,456 | $ 20,322 | $ 21,085 | $ 18,780 | 11,008 | $ 22,334 | $ 18,859 | $ 22,740 | 78,643 | 74,941 | 33,768
Net (income) loss attributable to noncontrolling interests - Common units in COPLP |  |  |  |  |  |  |  |  | (1,742) | (1,890) | (507)
Net income attributable to COPT/COPLP | 17,020 | 18,697 | 19,434 | 17,150 | 9,621 | 20,579 | 17,526 | 21,019 | 72,301 | 68,745 | 28,890
Net income (loss) attributable to COPT/COPLP common share/unit holders | 17,020 | 18,697 | 19,434 | 17,150 | 9,621 | 20,579 | 7,640 | 17,839 | 72,301 | $ 55,679 | $ 14,576
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.56 | $ 0.15
Comprehensive income |  |  |  |  |  |  |  |  | 76,073 | $ 78,968 | $ 34,899
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  | 69,620 | 72,643 | 29,997
Common units | 1,102 |  |  |  | 1,013 |  |  |  | 1,102 | 1,013 |
Corporate Office Properties, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture | 39,845 |  |  |  | 41,787 |  |  |  | 39,845 | 41,787 | 43,661
Noncontrolling interests in subsidiaries | 13,714 |  |  |  | 12,312 |  |  |  | 13,714 | 12,312 |
Gain on sales of real estate |  |  |  |  |  |  |  |  | 2,340 | 9,890 | 59,679
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  | 75,583 | 74,549 | 33,260
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 2,697 | 1,490 | 752
Net income | 18,456 | 20,322 | 21,085 | 18,780 | 11,008 | 22,334 | 18,859 | 22,740 | 78,643 | 74,941 | 33,768
Net income attributable to COPT/COPLP | 17,395 | 19,242 | 20,207 | 17,859 | 10,100 | 21,437 | 17,952 | 21,806 | 74,703 | 71,295 | 30,053
Net income (loss) attributable to COPT/COPLP common share/unit holders | 17,230 | $ 19,077 | $ 20,042 | $ 17,694 | 9,935 | $ 21,272 | $ 7,901 | $ 18,461 | 74,043 | $ 57,569 | $ 15,079
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.56 | $ 0.15
Comprehensive income |  |  |  |  |  |  |  |  | 76,073 | $ 78,968 | $ 34,899
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  | 72,133 | 75,322 | 31,184
Common units | $ 1,604,655 |  |  |  | 1,445,022 |  |  |  | $ 1,604,655 | 1,445,022 | 1,419,710
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  |  |  |  | 25,066 |  |  |  |  | 25,066 | 25,548
Cumulative distributions in excess of net income |  |  |  |  | (818,190) |  |  |  |  | (818,190) | (765,276)
Noncontrolling interests in subsidiaries |  |  |  |  | 65,549 |  |  |  |  | 65,549 | 71,605
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 9,890 | 40,986
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  |  | 74,549 | 14,567
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  |  | 2,882 | 1,332
Net income |  |  |  |  |  |  |  |  |  | 76,333 | 15,655
Net (income) loss attributable to noncontrolling interests - Common units in COPLP |  |  |  |  |  |  |  |  |  | (1,936) | 155
Net income attributable to COPT/COPLP |  |  |  |  |  |  |  |  |  | 70,091 | 11,439
Net income (loss) attributable to COPT/COPLP common share/unit holders |  |  |  |  |  |  |  |  |  | $ 57,025 | $ (2,875)
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.57 | $ (0.03)
Comprehensive income |  |  |  |  |  |  |  |  |  | $ 80,360 | $ 16,786
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  |  | 73,989 | 12,546
As Previously Reported [Member] | Corporate Office Properties, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  |  |  |  | 25,066 |  |  |  |  | 25,066 | 25,548
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 9,890 | 40,986
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  |  | 74,549 | 14,567
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  |  | 2,882 | 1,332
Net income |  |  |  |  |  |  |  |  |  | 76,333 | 15,655
Net income attributable to COPT/COPLP |  |  |  |  |  |  |  |  |  | 72,687 | 11,940
Net income (loss) attributable to COPT/COPLP common share/unit holders |  |  |  |  |  |  |  |  |  | $ 58,961 | $ (3,034)
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.57 | $ (0.04)
Comprehensive income |  |  |  |  |  |  |  |  |  | $ 80,360 | $ 16,786
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  |  | 76,714 | 13,071
Common units |  |  |  |  | 1,428,301 |  |  |  |  | 1,428,301 | 1,401,597
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  |  |  |  | 16,721 |  |  |  |  | 16,721 | 18,113
Cumulative distributions in excess of net income |  |  |  |  | 16,105 |  |  |  |  | 16,105 | 17,451
Noncontrolling interests in subsidiaries |  |  |  |  | 616 |  |  |  |  | 616 | 662
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 0 | 18,693
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  |  | 0 | 18,693
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  |  | (1,392) | (580)
Net income |  |  |  |  |  |  |  |  |  | (1,392) | 18,113
Net (income) loss attributable to noncontrolling interests - Common units in COPLP |  |  |  |  |  |  |  |  |  | 46 | (662)
Net income attributable to COPT/COPLP |  |  |  |  |  |  |  |  |  | (1,346) | 17,451
Net income (loss) attributable to COPT/COPLP common share/unit holders |  |  |  |  |  |  |  |  |  | $ (1,346) | $ 17,451
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.01) | $ 0.18
Comprehensive income |  |  |  |  |  |  |  |  |  | $ (1,392) | $ 18,113
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  |  | (1,346) | 17,451
Accounting Standards Update 2017-05 [Member] | Corporate Office Properties, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  |  |  |  | 16,721 |  |  |  |  | 16,721 | 18,113
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 0 | 18,693
Income before equity in income of unconsolidated entities and income taxes |  |  |  |  |  |  |  |  |  | 0 | 18,693
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  |  | (1,392) | (580)
Net income |  |  |  |  |  |  |  |  |  | (1,392) | 18,113
Net income attributable to COPT/COPLP |  |  |  |  |  |  |  |  |  | (1,392) | 18,113
Net income (loss) attributable to COPT/COPLP common share/unit holders |  |  |  |  |  |  |  |  |  | $ (1,392) | $ 18,113
Earnings per common share/unit - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.01) | $ 0.19
Comprehensive income |  |  |  |  |  |  |  |  |  | $ (1,392) | $ 18,113
Comprehensive income attributable to COPT/ COPLP |  |  |  |  |  |  |  |  |  | (1,392) | 18,113
Common units |  |  |  |  | $ 16,721 |  |  |  |  | $ 16,721 | $ 18,113

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