Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES:
Rental property revenues	$ 96,016	$ 86,857	$ 282,226	$ 244,375
Fee income	1,686	1,802	5,206	6,165
Other	444	439	593	4,786
Total consolidated revenues	98,146	89,098	288,025	255,326
COSTS AND EXPENSES:
Rental property operating expenses	41,331	38,685	120,672	109,501
Reimbursed expenses	686	783	2,514	2,703
General and administrative expenses	2,971	5,021	12,502	16,388
Interest expense	7,673	6,817	23,219	20,954
Depreciation and amortization	32,538	32,704	103,564	101,979
Acquisition and related costs	19	644	104	815
Other	175	481	873	1,936
Total costs and expenses	85,393	85,135	263,448	254,276
Income from continuing operations before taxes, unconsolidated joint ventures, and gain on sale of investment properties	12,753	3,963	24,577	1,050
Benefit (provision) for income taxes from operations	0	(1)	0	20
Income from unconsolidated joint ventures	3,716	2,030	7,088	5,343
Income from continuing operations before gain on sale of investment properties	16,469	5,992	31,665	6,413
Gain on sale of investment properties	37,145	81	37,674	1,569
Income from continuing operations	53,614	6,073	69,339	7,982
INCOME (LOSS) FROM DISCONTINUED OPERATIONS:
Income (loss) from discontinued operations	6	348	(14)	1,806
Gain (loss) on sale from discontinued operations	0	12,993	(551)	19,372
Total income from discontinued operations	6	13,341	(565)	21,178
Net income	53,620	19,414	68,774	29,160
Net income attributable to noncontrolling interests	0	(92)	0	(376)
Net income attributable to controlling interests	53,620	19,322	68,774	28,784
Dividends to preferred stockholders	0	0	0	(2,955)
Preferred Share Original Issuance Costs	0	0	0	3,530
Net income available to common stockholders	$ 53,620	$ 19,322	$ 68,774	$ 22,299
PER COMMON SHARE INFORMATION - BASIC AND DILUTED:
Income from continuing operations attributable to controlling interest	$ 0.25	$ 0.03	$ 0.32	$ 0.00
Income from discontinued operations	0.00	0.06	0.00	0.11
Net income available to common stockholders	$ 0.25	$ 0.09	$ 0.32	$ 0.11
Weighted average shares — basic	216,261	209,839	216,485	200,073
Weighted average shares — diluted	216,374	210,111	216,625	200,325
Dividends declared per common share	$ 0.080	$ 0.075	$ 0.240	$ 0.225
Total Segment [Member]
REVENUES:
Total consolidated revenues	$ 98,146			$ 89,098
COSTS AND EXPENSES:
Rental property operating expenses				(38,685)
Reimbursed expenses	686	$ 783	$ 2,514	2,703
INCOME (LOSS) FROM DISCONTINUED OPERATIONS:
Dividends to preferred stockholders		0		(6,485)
Net income available to common stockholders	$ 53,620	$ 19,322	$ 68,774	$ 22,299