Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total rental property revenues	$ 475,212	$ 466,185	$ 259,211
Expenses:
Rental property operating expenses	164,678	163,882	96,908
Reimbursed expenses	3,782	3,527	3,259
General and administrative expenses	22,040	27,523	25,592
Interest expense	39,430	33,524	26,650
Depreciation and amortization	181,382	196,745	97,948
Acquisition and transaction costs	248	1,661	24,521
Other	556	1,796	5,888
Total costs and expenses	412,116	428,658	280,766
Gain (loss) on extinguishment of debt	8	2,258	(5,180)
Income (loss) from continuing operations before unconsolidated joint ventures and gain on sale of investment properties	63,104	39,785	(26,735)
Income from unconsolidated joint ventures	12,224	47,115	10,562
Income (loss) from continuing operations before gain on sale of investment properties	75,328	86,900	(16,173)
Gain on sale of investment properties	5,437	133,059	77,114
Income from continuing operations	80,765	219,959	60,941
Income from discontinued operations	0	0	19,163
Net income	80,765	219,959	80,104
Net income attributable to noncontrolling interests	(1,601)	(3,684)	(995)
Net income available to common stockholders	$ 79,164	$ 216,275	$ 79,109
Per common share information — basic and diluted:
Income from continuing operations (in usd per share)	$ 0.19	$ 0.52	$ 0.24
Income from discontinued operations (in usd per share)	0.00	0.00	0.07
Net income per common share - basic and diluted (in usd per share)	$ 0.19	$ 0.52	$ 0.31
Weighted average shares — basic (in shares)	420,305	415,610	253,895
Weighted average shares — diluted (in shares)	427,473	423,297	256,023
Dividends declared per common share (in usd per share)	$ 0.26	$ 0.3	$ 0.24
Rental property revenues
Revenues:
Total rental property revenues	$ 461,853	$ 446,035	$ 249,814
Fee income
Revenues:
Total rental property revenues	10,089	8,632	8,347
Other
Revenues:
Total rental property revenues	$ 3,270	$ 11,518	$ 1,050