Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES
Rental income	$ 422,852	$ 407,481	$ 383,333
Mortgage interest			91
Other operating	1,647	4,149	5,047
Total Revenue	424,499	411,630	388,471
EXPENSES
Property operating	157,233	146,458	140,195
General and administrative	32,992	31,309	24,716
Acquisition and pursuit costs	2,180	4,496	2,209
Depreciation and amortization	142,472	127,690	116,614
Bad debt, net of recoveries	169	(21)	(193)
Total Expenses	335,046	309,932	283,541
OTHER INCOME (EXPENSE)
Gain on sales of real estate assets	39,519	41,038	56,602
Interest Expense	(56,402)	(57,351)	(65,534)
Loss on extinguishment of debt	(44,985)		(27,998)
Pension termination		(4)	(5,260)
Impairment of real estate assets	(5,385)		(3,639)
Impairment of internally-developed software			(654)
Interest and other income, net	896	375	389
Total other income (expense)	(66,357)	(15,942)	(46,094)
INCOME FROM CONTINUING OPERATIONS	23,096	85,756	58,836
DISCONTINUED OPERATIONS
Income (loss) from discontinued operations	(9)	(71)	715
Impairments of real estate assets		(121)	(686)
Gain on sales of real estate properties	5	7	10,571
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	(4)	(185)	10,600
NET INCOME	$ 23,092	$ 85,571	$ 69,436
BASIC EARNINGS PER COMMON SHARE:
Income from continuing operations (in dollars per share)	$ 0.18	$ 0.79	$ 0.59
Discontinued operations (in dollars per share)	0.00	0.00	0.11
Net income (in dollars per share)	0.18	0.79	0.70
DILUTED EARNINGS PER COMMON SHARE:
Income from continuing operations (in dollars per share)	0.18	0.78	0.59
Discontinued operations (in dollars per share)	0.00	0.00	0.11
Net income (in dollars per share)	$ 0.18	$ 0.78	$ 0.70
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares)	117,926,158	108,572,102	99,171,352
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares)	118,017,165	109,386,997	99,880,302