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Real Estate (Acquisitions) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
lease_asset
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
property
Real Estate Properties [Line Items]      
Number of net lease assets acquired | lease_asset 1    
Acquisitions of real estate assets $ 38,433 $ 0 $ 4,666
Payments for land and funded tenant improvements $ 3,900    
Number of properties acquired | property 2    
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     8,300
Business combination, pro forma information, loss of acquiree since acquisition date, actual     (2,900)
Net Lease Asset      
Real Estate Properties [Line Items]      
Acquisitions of real estate assets $ 32,700    
Operating leases, term 99 years    
Real Estate Acquired in Satisfaction of Debt      
Real Estate Properties [Line Items]      
Fair value of assets acquired   $ 13,400  
Real Estate Acquired in Satisfaction of Debt | Commercial Operating Properties      
Real Estate Properties [Line Items]      
Fair value of assets acquired     $ 72,400
Number of properties acquired | property     3