Quarterly report pursuant to Section 13 or 15(d)

Disposition of Properties and Properties Held for Sale (Components of Assets Held for Sale) (Details)

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Disposition of Properties and Properties Held for Sale (Components of Assets Held for Sale) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Long Lived Assets Held-for-sale [Line Items]    
Rental property held for sale $ 46,862 $ 46,005
Rental property, net [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Rental property held for sale 44,252 43,532
Deferred lease costs and other intangibles, net [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Rental property held for sale 888 757
Prepaids and other assets [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Rental property held for sale $ 1,722 $ 1,716