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Selected Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Notes To Financial Statements [Abstract]  
Schedule of Quarterly Financial Information
 
Year Ended December 31, 2012
 
First
 
Second
 
Third
 
Fourth
Total operating revenues
$
104,129

 
$
109,644

 
$
114,519

 
$
118,257

Income from continuing operations before non-operating items
$
25,979

 
$
28,433

 
$
28,625

 
$
32,839

Interest expense
$
(12,792
)
 
$
(12,674
)
 
$
(12,921
)
 
$
(13,862
)
(Loss) from real estate joint ventures
$
(31
)
 
$
(69
)
 
$
(70
)
 
$
(53
)
Discontinued operations:
 

 
 

 
 

 
 

Income (loss) from discontinued operations before gain on sale
$
484

 
$
467

 
$
(451
)
 
$
77

Gain on sale of discontinued operations
$
9,500

 
$
12,953

 
$
16,021

 
$
3,161

Consolidated net income
$
22,484

 
$
28,421

 
$
30,604

 
$
20,754

Net income attributable to noncontrolling interest
$
148

 
$
135

 
$
3,138

 
$
104

Net income available for common unitholders
$
22,336

 
$
28,286

 
$
27,466

 
$
20,650

 
 
 
 
 
 
 
 
Per unit:
 

 
 

 
 

 
 

Net income available for common unitholders per common unit - basic and diluted
$
0.57

 
$
0.70

 
$
0.67

 
$
0.50

Distribution paid per unit
$
0.6600

 
$
0.6600

 
$
0.6600

 
$
0.6600

 

 
Year Ended December 31, 2011
 
First
 
Second
 
Third
 
Fourth
Total operating revenues
$
90,627

 
$
94,214

 
$
99,302

 
$
101,477

Income from continuing operations before non-operating items
$
19,353

 
$
20,186

 
$
20,405

 
$
24,431

Interest expense
$
(13,469
)
 
$
(13,626
)
 
$
(14,867
)
 
$
(9,240
)
Loss from real estate joint ventures
$
(245
)
 
$
(178
)
 
$
(107
)
 
$
(63
)
Discontinued operations:
 

 
 

 
 

 
 

Income from discontinued operations before gain on sale
$
981

 
$
987

 
$
791

 
$
866

Gain on sale of discontinued operations
$
—

 
$
—

 
$
4,927

 
$
7,872

Consolidated net income
$
6,149

 
$
6,531

 
$
10,549

 
$
23,709

Net income attributable to noncontrolling interest
$
76

 
$
135

 
$
118

 
$
92

Net income available for common unitholders
$
6,073

 
$
6,396

 
$
10,431

 
$
23,617

 
 
 
 
 
 
 
 
Per unit:
 

 
 

 
 

 
 

Net income available for common unitholders per common unit- basic and diluted
$
0.17

 
$
0.18

 
$
0.28

 
$
0.62

Distribution paid per unit
$
0.6275

 
$
0.6275

 
$
0.6275

 
$
0.6275