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Acquisitions and Dispositions (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Jun. 10, 2013
Management Internalization
Jun. 10, 2013
Management Internalization
Trademark
Jun. 10, 2013
Management Internalization
Database
Jun. 11, 2013
Alaska Joint Venture Acquisition
Acquisitions And Dispositions            
Land           $ 156,648
Buildings and improvements     4,214     740,396
Identified intangible assets       3,100 2,100  
Receivable for net cash flows prior to acquisition date           1,896
Value of in-place leases           5,547
Goodwill 120,655 120,655 120,655      
Fair value of acquired assets     $ 130,069     $ 904,487