Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Revenues	$ 118,706	$ 113,159	$ 352,536	$ 352,073
Expenses:
Rental property operating expenses	41,579	40,688	122,501	123,715
Reimbursed expenses	955	895	2,757	2,667
General and administrative expenses	3,913	7,193	18,793	21,993
Interest expense	9,551	7,587	29,043	25,851
Depreciation and amortization	45,068	47,622	135,836	152,546
Acquisition and transaction costs	0	(677)	228	1,499
Other	93	423	457	1,063
Total expenses	101,159	103,731	309,615	329,334
Gain on extinguishment of debt	93	429	8	2,258
Income from continuing operations before unconsolidated joint ventures and gain (loss) on sale of investment properties	17,640	9,857	42,929	24,997
Income from unconsolidated joint ventures	2,252	2,461	10,173	43,362
Income from continuing operations before gain (loss) on sale of investment properties	19,892	12,318	53,102	68,359
Gain (loss) on sale of investment properties	(33)	(33)	4,912	119,729
Net income	19,859	12,285	58,014	188,088
Net income attributable to noncontrolling interests	(374)	(218)	(1,210)	(3,181)
Net income available to common stockholders	$ 19,485	$ 12,067	$ 56,804	$ 184,907
Net income per common share — basic and diluted (in usd per share)	$ 0.05	$ 0.03	$ 0.14	$ 0.45
Weighted average shares — basic (in shares)	420,385	419,998	420,279	414,123
Weighted average shares — diluted (in shares)	427,520	427,300	427,472	421,954
Dividends declared per common share (in usd per share)	$ 0.065	$ 0.060	$ 0.195	$ 0.240
Rental property revenues
Revenues:
Revenues	$ 115,443	$ 109,569	$ 342,489	$ 336,093
Fee income
Revenues:
Revenues	2,519	2,597	7,211	6,387
Other
Revenues:
Revenues	$ 744	$ 993	$ 2,836	$ 9,593