Annual report pursuant to Section 13 and 15(d)

Disposition of Properties and Properties Held for Sale (Details)

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Disposition of Properties and Properties Held for Sale (Details)
ft² in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended
Oct. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
ft²
Sep. 30, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
ft²
Oct. 30, 2015
ft²
Barstow [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Square Feet | ft²         171
Net Sales Price $ 105,793        
Gain on sale of assets and interests in unconsolidated entities $ 86,506        
Kittery I & II, Tuscola, & West Branch [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Square Feet | ft²   439 439    
Net Sales Price   $ 43,304      
Gain on sale of assets and interests in unconsolidated entities   $ 20,215 $ 20,215    
Lincoln City [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Square Feet | ft²       270  
Net Sales Price       $ 38,993  
Gain on sale of assets and interests in unconsolidated entities       $ 7,513