CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Rental revenue	$ 58,763	$ 54,927	$ 62,134
Other revenue	4,377	3,075	4,144
Total revenues	63,140	58,002	66,278
Expenses:
Operating expenses	24,184	25,893	28,858
Depreciation and amortization	17,810	17,774	19,329
General and administrative	30,378	37,444	33,233
Total expenses	72,372	81,111	81,420
Interest and other income, net	46,945	6,800	21,228
Interest expense (including net amortization of debt premiums and deferred financing fees of $—, $— and $(119), respectively)	0	0	(620)
Gain on early extinguishment of debt	0	0	131
Gain on sale of properties, net	97	0	446,744
Income (loss) before income taxes	37,810	(16,309)	452,341
Income tax expense	(453)	(120)	(248)
Net income (loss)	37,357	(16,429)	452,093
Net (income) loss attributable to noncontrolling interest	(94)	33	(799)
Net income (loss) attributable to Equity Commonwealth	37,263	(16,396)	451,294
Preferred distributions	(7,988)	(7,988)	(7,988)
Net income (loss) attributable to Equity Commonwealth common shareholders	$ 29,275	$ (24,384)	$ 443,306
Weighted average common shares outstanding — basic (in shares)	111,674	121,411	121,786
Weighted average common shares outstanding — diluted (in shares)	112,825	121,411	126,606
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic (in dollars per share)	$ 0.26	$ (0.20)	$ 3.64
Diluted (in dollars per share)	$ 0.26	$ (0.20)	$ 3.56