CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Rental income	$ 147,572	$ 145,806	$ 429,195	$ 441,294
Expenses:
Real estate taxes	20,067	16,113	52,133	48,701
Utility expenses	7,389	7,564	19,131	19,777
Other operating expenses	26,537	26,366	76,874	78,033
Depreciation and amortization	59,533	62,227	178,991	189,340
Loss on impairment of real estate	(3)	2,954	55,854	2,954
General and administrative	448	7,059	24,690	21,372
Total expenses	113,971	122,283	407,673	360,177
Gain on sale of real estate	36	0	54,154	10,822
Interest and other income	0	2	7	738
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $2,442, $2,477, $7,366 and $7,162, respectively)	(26,929)	(27,097)	(84,728)	(79,461)
Loss on early extinguishment of debt	(2,274)	0	(14,068)	(3,839)
Income (loss) before income tax (expense) benefit and equity in net losses of investees	4,434	(3,572)	(23,113)	9,377
Income tax (expense) benefit	(34)	54	(348)	(220)
Equity in net losses of investees	(688)	(279)	(1,664)	(815)
Net income (loss)	3,712	(3,797)	(25,125)	8,342
Other comprehensive income (loss):
Unrealized gain on financial instrument	0	85	0	200
Other comprehensive income	0	85	0	200
Comprehensive income (loss)	$ 3,712	$ (3,712)	$ (25,125)	$ 8,542
Weighted average common shares outstanding (basic) (in shares)	48,211	48,132	48,179	48,111
Weighted average common shares outstanding (diluted) (in shares)	48,244	48,132	48,179	48,111
Per common share amounts (basic and diluted):
Net income (loss) per common share - basic (in dollars per share)	$ 0.08	$ (0.08)	$ (0.52)	$ 0.17
Net income (loss) per common share - diluted (in dollars per share)	$ 0.08	$ (0.08)	$ (0.52)	$ 0.17