Annual report pursuant to Section 13 and 15(d)

Information by Business Segment (Details 2)

v3.8.0.1
Information by Business Segment (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of segment revenues to total revenues                      
Segment revenues from real estate operations                 $ 509,980 $ 525,964 $ 519,068
Construction contract and other service revenues                 102,840 48,364 106,402
Less: Revenues from discontinued operations                 0 0 (4)
Total revenues $ 164,567 $ 157,017 $ 151,435 $ 139,801 $ 141,991 $ 142,103 $ 145,927 $ 144,307 612,820 574,328 625,466
Reconciliation of segment property operating expenses to property operating expenses                      
Segment property operating expenses                 190,964 197,530 194,488
Less: Property operating expenses from discontinued operations                 0 0 6
Total property operating expenses                 190,964 197,530 194,494
Reconciliation of Operatiing Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract]                      
UJV NOI allocable to COPT                 5,188 2,305 0
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense                 (2,301) (993) 0
Add: Equity in (loss) income of unconsolidated non-real estate entities                 (5) 20 62
Equity in income of unconsolidated entities                 2,882 1,332 62
Computation of net operating income from service operations                      
Construction contract and other service revenues                 102,840 48,364 106,402
Construction contract and other service expenses                 (99,618) (45,481) (102,696)
NOI from service operations                 $ 3,222 $ 2,883 $ 3,706