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Gain on Sales of Real Estate (Details) (New properties and properties under development, 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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Gain on sales of real estate        
Number of properties sold 6 17 17 34
Sales proceeds $ 7,000,000 $ 23,700,000 $ 19,700,000 $ 83,700,000
Gain on sales of real estate 2,000,000 5,700,000 5,800,000 44,300,000
Crest
       
Gain on sales of real estate        
Number of properties sold     1  
Sales proceeds     820,000  
Gain on sales of real estate     $ 0