Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUES
Rental income	$ 383,333	$ 361,525	$ 312,322
Mortgage interest	91	3,665	12,701
Other operating	5,047	5,665	5,926
Total Revenue	388,471	370,855	330,949
EXPENSES
Property operating	140,195	134,057	122,571
General and administrative	26,925	22,808	23,704
Depreciation	106,530	99,384	86,239
Amortization	10,084	10,820	10,645
Bad debt, net of recoveries	(193)	31	172
Total Expenses	283,541	267,100	243,331
OTHER INCOME (EXPENSE)
Gain on sales of real estate properties	56,602
Interest Expense	(65,534)	(72,413)	(73,511)
Loss on extinguishment of debt	(27,998)		(29,638)
Pension termination	(5,260)
Impairment of real estate assets	(3,639)
Impairment of internally-developed software	(654)
Gain on sale of cost method investment in real estate			1,492
Interest and other income, net	389	2,637	947
Total other income (expense)	(46,094)	(69,776)	(100,710)
INCOME (LOSS) FROM CONTINUING OPERATIONS	58,836	33,979	(13,092)
DISCONTINUED OPERATIONS
Income from discontinued operations	715	967	5,246
Impairments of real estate assets	(686)	(12,029)	(9,889)
Gain on sales of real estate properties	10,571	9,283	24,718
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	10,600	(1,779)	20,075
NET INCOME	69,436	32,200	6,983
Less: Net income attributable to noncontrolling interests		(313)	(37)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 69,436	$ 31,887	$ 6,946
BASIC EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)	$ 0.59	$ 0.35	$ (0.14)
Discontinued operations (in dollars per share)	0.11	(0.02)	0.22
Net income attributable to common stockholders (in dollars per share)	0.70	0.33	0.08
DILUTED EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)	0.59	0.35	(0.14)
Discontinued operations (in dollars per share)	0.11	(0.02)	0.22
Net income attributable to common stockholders (in dollars per share)	$ 0.70	$ 0.33	$ 0.08
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares)	99,171,352	95,279,226	90,940,627
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares)	99,880,302	96,759,410	90,940,627