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Noncontrolling Interests - Variable interest entity (Details) - Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Variable interest entity    
Net real estate $ 2,961,127 $ 2,936,397
Total assets 3,348,144 3,342,443
Total debt 198,332 210,384
Total liabilities $ 330,757 $ 313,295