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Impairments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Impairments        
Provisions for impairment   $ 76,000   $ 3,000,000
Number of impaired properties sold 1 1 6 8
Number of impaired properties held-for-sale 3   3 1
Provision for impairment, amount included in income from continuing operations $ 495,000   $ 2,700,000 $ 290,000
Number of properties not held for sale and included in income from discontinued operations       1
Consumer electronics industry
       
Impairments        
Number of impaired properties     1  
Home furnishings industry
       
Impairments        
Number of impaired properties     1  
Convenience stores
       
Impairments        
Number of impaired properties 1   1  
Home improvement
       
Impairments        
Number of impaired properties 2   2  
Restaurant - casual dining industry
       
Impairments        
Number of impaired properties sold   1    
Number of impaired properties 1 1 4 2
Automotive service industry
       
Impairments        
Number of impaired properties       2
Grocery store industry
       
Impairments        
Number of impaired properties       1
Automotive parts industry
       
Impairments        
Number of impaired properties       1
Child care industry
       
Impairments        
Number of impaired properties       2
Pet supplies and services industry
       
Impairments        
Number of impaired properties       1