Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 60,824	$ (6,079)
Other comprehensive income:
Unrealized income on interest rate derivatives	2,537	784
Reclassification adjustments on interest rate derivatives recognized in interest expense	1,003	1,175
Total other comprehensive income	3,540	1,959
Comprehensive income (loss)	64,364	(4,120)
Comprehensive income attributable to noncontrolling interests	(1,822)	(783)
Comprehensive income (loss) attributable to COPT	$ 62,542	$ (4,903)