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Impairments (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Impairments        
Provisions for impairment   $ 2,500,000   $ 3,000,000
Number of impaired properties sold   1 3 7
Number of impaired properties held-for-sale 2 2 3 2
Provision for impairment, amount included in income from continuing operations $ 499,000 $ 290,000 $ 2,200,000 $ 290,000
Number of properties not held for sale and included in income from discontinued operations   1   1
Consumer electronics industry
        
Impairments        
Number of impaired properties     1  
Home furnishings industry
        
Impairments        
Number of impaired properties     1  
Home improvement
        
Impairments        
Number of impaired properties 1   1  
Restaurant - casual dining industry
        
Impairments        
Number of impaired properties 1   3 1
Automotive service industry
        
Impairments        
Number of impaired properties   1   2
Grocery store industry
        
Impairments        
Number of impaired properties   1   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
Other
        
Impairments        
Number of impaired properties   1   1