CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Rental revenue	$ 54,927	$ 62,134	$ 116,869
Other revenue	3,075	4,144	10,981
Revenues, Total	58,002	66,278	127,850
Expenses:
Operating expenses	25,893	28,858	46,418
Depreciation and amortization	17,774	19,329	28,122
General and administrative	37,444	33,233	38,442
Total expenses	81,111	81,420	112,982
Interest and other income, net	6,800	21,228	72,392
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $—, $(119) and $204, respectively)	0	(620)	(8,908)
Gain (loss) on early extinguishment of debt	0	131	(6,374)
Gain on sale of properties, net	0	446,744	422,172
(Loss) income before income taxes	(16,309)	452,341	494,150
Income tax expense	(120)	(248)	(1,284)
Net (loss) income	(16,429)	452,093	492,866
Net loss (income) attributable to noncontrolling interest	33	(799)	(186)
Net (loss) income attributable to Equity Commonwealth	(16,396)	451,294	492,680
Preferred distributions	(7,988)	(7,988)	(7,988)
Net (loss) income attributable to Equity Commonwealth common shareholders	$ (24,384)	$ 443,306	$ 484,692
Weighted average common shares outstanding — basic (in shares)	121,411	121,786	122,091
Weighted average common shares outstanding — diluted (in shares)	121,411	126,606	126,260
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic (in dollars per share)	$ (0.20)	$ 3.64	$ 3.97
Diluted (in dollars per share)	$ (0.20)	$ 3.56	$ 3.90