Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue
Real estate rental revenue	$ 78,272	$ 75,590	$ 155,196	$ 150,804
Expenses
Real estate expenses	27,429	25,033	54,520	50,584
Depreciation and amortization	25,582	25,227	51,106	50,809
Acquisition Costs	87	254	300	308
General and administrative	4,005	4,164	7,867	7,770
Total expenses	57,103	54,678	113,793	109,471
Real estate operating income	21,169	20,912	41,403	41,333
Other income (expense)
Interest expense	(16,152)	(15,470)	(32,670)	(31,301)
Other income	246	252	485	496
Total other income (expense)	(15,906)	(15,218)	(32,185)	(30,805)
Income from continuing operations	5,263	5,694	9,218	10,528
Discontinued operations:
Income from operations of properties sold or held for sale	0	314	185	661
Gain on sale of real estate	0	0	3,195	0
Net income	5,263	6,008	12,598	11,189
Net Income (Loss) Attributable to Noncontrolling Interest	$ 0	$ 0	$ 0	$ 0
Basic net income per share:
Continuing operations (in dollars per share)	$ 0.08	$ 0.08	$ 0.14	$ 0.15
Discontinued operations (in dollars per share)	$ 0.00	$ 0.01	$ 0.05	$ 0.01
Net income per share (in dollars per share)	$ 0.08	$ 0.09	$ 0.19	$ 0.16
Diluted net income per share:
Continuing operations (in dollars per share)	$ 0.08	$ 0.08	$ 0.14	$ 0.15
Discontinued operations (in dollars per share)	$ 0.00	$ 0.01	$ 0.05	$ 0.01
Net income per share (in dollars per share)	$ 0.08	$ 0.09	$ 0.19	$ 0.16
Weighted average shares outstanding - basic (in shares)	66,405	66,241	66,399	66,218
Weighted average shares outstanding - diluted (in shares)	66,556	66,380	66,537	66,354
Dividends declared per share (in dollars per share)	$ 0.3000	$ 0.4338	$ 0.6000	$ 0.8676