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Gain on Sales of Real Estate (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
item
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
item
Sales of investment properties        
Sales proceeds       $ 6,918,000
Income from discontinued operations       $ 3,097,000
New properties and properties under development        
Sales of investment properties        
Number of properties sold | item 8 11 22 28
Sales proceeds $ 21,500,000 $ 33,800,000 $ 52,000,000 $ 53,600,000
Gain on sales of investment properties $ 6,200,000 $ 11,000,000 $ 17,100,000 16,800,000
Income from discontinued operations       $ 2,600,000
New properties and properties under development | Crest Net Lease, Inc. (Crest)        
Sales of investment properties        
Number of properties sold | item       1
Sales proceeds       $ 820,000