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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]  
Summary of quarterly financial information
Quarterly financial information for the years ended December 31, 2012 and 2011 is summarized below. The results of operations have been restated, as applicable, to show the effect of reclassifying properties sold or to be sold as discontinued operations. 
 
Quarter Ended
(Dollars in thousands, except per share data)
March 31
 
June 30
 
September 30
 
December 31
2012
 
 
 
 
 
 
 
Revenues from continuing operations
$
77,011

 
$
78,551

 
$
79,528

 
$
81,260

Income from continuing operations
$
2,084

 
$
2,826

 
$
2,507

 
$
395

Discontinued operations
$
1,050

 
102

 
3,328

 
(6,757
)
Net income (loss)
3,134

 
2,928

 
5,835

 
(6,362
)
Less: (Income) from noncontrolling interests
—

 
(20
)
 
(20
)
 
(30
)
Net income (loss) attributable to common stockholders
$
3,134

 
$
2,908

 
$
5,815

 
$
(6,392
)
Basic earnings (loss) per common share:
 
 
 
 
 
 
 
Income from continuing operations
$
0.03

 
$
0.04

 
$
0.04

 
$
0.00

Discontinued operations
0.01

 
0.00

 
0.04

 
(0.07
)
Net income (loss) attributable to common stockholders
$
0.04

 
$
0.04

 
$
0.08

 
$
(0.07
)
Diluted earnings (loss) per common share:
 
 
 
 
 
 
 
Income from continuing operations
$
0.03

 
$
0.04

 
$
0.03

 
$
0.00

Discontinued operations
0.01

 
0.00

 
0.04

 
(0.07
)
Net income (loss) attributable to common stockholders
$
0.04

 
$
0.04

 
$
0.07

 
$
(0.07
)
2011
 
 
 
 
 
 
 
Revenues from continuing operations
$
70,716

 
$
71,358

 
$
74,259

 
$
75,259

Income (loss) from continuing operations
$
(6,200
)
 
$
1,489

 
$
46

 
$
1,739

Discontinued operations
438

 
522

 
604

 
1,178

Net income (loss)
(5,762
)
 
2,011

 
650

 
2,917

Less: (Income) loss from noncontrolling interests
(27
)
 
—

 
(3
)
 
—

Net income (loss) attributable to common stockholders
$
(5,789
)
 
$
2,011

 
$
647

 
$
2,917

Basic earnings (loss) per common share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
(0.10
)
 
$
0.02

 
$
0.00

 
$
0.02

Discontinued operations
0.01

 
0.01

 
0.01

 
0.02

Net income (loss) attributable to common stockholders
$
(0.09
)
 
$
0.03

 
$
0.01

 
$
0.04

Diluted earnings (loss) per common share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
(0.10
)
 
$
0.02

 
$
0.00

 
$
0.02

Discontinued operations
0.01

 
0.01

 
0.01

 
0.02

Net income (loss) attributable to common stockholders
$
(0.09
)
 
$
0.03

 
$
0.01

 
$
0.04