CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Rental income	$ 145,806	$ 167,411	$ 441,294	$ 518,220
Expenses:
Real estate taxes	16,113	18,824	48,701	55,363
Utility expenses	7,564	9,518	19,777	26,369
Other operating expenses	26,366	30,376	78,033	90,204
Depreciation and amortization	62,227	74,939	189,340	226,373
Loss on impairment of real estate	2,954	8,521	2,954	14,105
Acquisition and transaction related costs	0	0	0	682
General and administrative	7,059	7,990	21,372	25,457
Total expenses	122,283	150,168	360,177	438,553
Gain on sale of real estate	0	11,463	10,822	33,538
Dividend income	0	0	0	1,960
Loss on equity securities, net	0	0	0	(44,007)
Interest and other income	2	358	738	847
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $2,477, $2,560, $7,162 and $8,264, respectively)	(27,097)	(32,367)	(79,461)	(104,848)
Loss on early extinguishment of debt	0	(284)	(3,839)	(769)
Income (loss) before income tax (expense) benefit and equity in net losses of investees	(3,572)	(3,587)	9,377	(33,612)
Income tax (expense) benefit	54	(156)	(220)	(509)
Equity in net losses of investees	(279)	(196)	(815)	(573)
Net income (loss)	(3,797)	(3,939)	8,342	(34,694)
Other comprehensive income (loss):
Unrealized gain (loss) on financial instrument	85	80	200	(287)
Equity in unrealized gain (loss) of investees	0	(46)	0	91
Other comprehensive income (loss)	85	34	200	(196)
Comprehensive income (loss)	$ (3,712)	$ (3,905)	$ 8,542	$ (34,890)
Weighted average common shares outstanding (basic and diluted) (in shares)	48,132	48,073	48,111	48,051
Per common share amounts (basic and diluted):
Net income (loss) (in dollars per share)	$ (0.08)	$ (0.08)	$ 0.17	$ (0.72)