Consolidated Statements of Operations and Other Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Lease income	$ 481,686	$ 482,497	$ 538,139
Expenses:
Operating expenses	68,396	74,885	84,556
Real estate taxes	73,247	73,683	82,755
Depreciation and amortization	194,573	175,977	203,866
Provision for impairment of investment properties	12,298	2,079	67,003
General and administrative expenses	40,489	42,363	40,724
Total expenses	389,003	368,987	478,904
Other (expense) income:
Interest expense	(76,571)	(73,746)	(146,092)
Gain on sales of investment properties	18,872	37,211	337,975
Other (expense) income, net	(2,587)	665	373
Net income	32,397	77,640	251,491
Net income attributable to noncontrolling interests	0	0	0
Net income attributable to the Company	32,397	77,640	251,491
Preferred stock dividends	0	0	(13,867)
Net income attributable to common shareholders	$ 32,397	$ 77,640	$ 237,624
Earnings per common share - basic and diluted:
Net income per common share attributable to common shareholders	$ 0.15	$ 0.35	$ 1.03
Net income	$ 32,397	$ 77,640	$ 251,491
Other comprehensive (loss) income:
Net unrealized (loss) gain on derivative instruments (Note 8)	(10,766)	(2,608)	352
Comprehensive income attributable to the Company	$ 21,631	$ 75,032	$ 251,843
Weighted average number of common shares outstanding – basic	212,948	217,830	230,747
Weighted average number of common shares outstanding – diluted	213,198	218,231	230,927