CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Rental income	$ 144,425	$ 270,320	$ 409,071
Total revenues	197,022	340,571	500,680
Expenses:
Operating expenses	79,916	141,425	200,706
Depreciation and amortization	49,041	90,708	131,806
General and administrative	44,439	47,760	50,256
Loss on asset impairment	12,087	19,714	58,476
Total expenses	185,483	299,607	441,244
Operating income	11,539	40,964	59,436
Interest and other income, net	46,815	26,380	10,331
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $2,553, $3,135, and $3,725, respectively)	(26,585)	(52,183)	(84,329)
Loss on early extinguishment of debt	(7,122)	(493)	(2,680)
Foreign currency exchange loss	0	0	(5)
Gain on sale of properties, net	251,417	15,498	250,886
Income before income taxes	276,064	30,166	233,639
Income tax expense	(3,156)	(500)	(745)
Net income	272,908	29,666	232,894
Net income attributable to noncontrolling interest	(95)	(10)	0
Net income attributable to Equity Commonwealth	272,813	29,656	232,894
Preferred distributions	(7,988)	(7,988)	(17,956)
Excess fair value of consideration paid over carrying value of preferred shares	0	0	(9,609)
Net income attributable to Equity Commonwealth common shareholders	$ 264,825	$ 21,668	$ 205,329
Weighted average common shares outstanding — basic (in shares)	122,314	124,125	125,474
Weighted average common shares outstanding — diluted (in shares)	123,385	125,129	126,768
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic (in dollars per share)	$ 2.17	$ 0.17	$ 1.64
Diluted (in dollars per share)	$ 2.15	$ 0.17	$ 1.62
Tenant reimbursements and other income
Revenues:
Revenues	$ 52,597	$ 70,251	$ 91,609