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Assets Held For Sale and Sales of Real Estate Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2017
USD ($)
Jan. 26, 2017
USD ($)
Jun. 02, 2016
USD ($)
May 02, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Long Lived Assets Held-for-sale [Line Items]                
Number of real estate properties held for sale (property) | property         3   3  
Impairment of Long-Lived Assets to be Disposed of           $ 7,000 $ 1,000 $ 15,000
Assets Held for Sale, Number of Properties Sold | property             6  
Proceeds from sale of real estate             $ 60,000  
Gain (Loss) on Sale of Properties           $ 0 $ 300 $ (449)
Denver, CO Property                
Long Lived Assets Held-for-sale [Line Items]                
Proceeds from sale of real estate   $ 23,000            
Chicago, IL Property                
Long Lived Assets Held-for-sale [Line Items]                
Assets Held for Sale, Number of Properties Sold | property         2      
Proceeds from sale of real estate $ 22,000       $ 1,000      
Sale Leaseback Transaction, Lease Terms P10Y              
Gain (Loss) on sales of real estate, deferred $ 13,000              
Baltimore, MD Property                
Long Lived Assets Held-for-sale [Line Items]                
Assets Held for Sale, Number of Properties Sold | property         2      
Proceeds from sale of real estate         $ 15,000      
Williamsburg, VA Property                
Long Lived Assets Held-for-sale [Line Items]                
Proceeds from sale of real estate         $ 1,000      
Allentown Property                
Long Lived Assets Held-for-sale [Line Items]                
Proceeds from sale of real estate     $ 8,000          
Deerfield Beach Property                
Long Lived Assets Held-for-sale [Line Items]                
Proceeds from sale of real estate       $ 24,000