Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Assets and liabilities of real estate held for sale (Details)

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Real Estate - Assets and liabilities of real estate held for sale (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]    
Investment in real estate sold or held for sale, net $ 464,535 $ 478,478
Less accumulated depreciation (118,378) (113,479)
Investment in real estate sold or held for sale, net 346,157 364,999
Mortgage notes 23,467 23,945
Other liabilities 7,808 8,412
Liabilities related to properties sold or held for sale 31,275 32,357
Office [Member]
   
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]    
Investment in real estate sold or held for sale, net 55,049 71,605
Medical Office [Member]
   
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]    
Investment in real estate sold or held for sale, net $ 409,486 $ 406,873