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Real Estate, Operating Real Estate and Assets Held for Sale - Summary of Assets Held for Sale (Details) - USD ($)
$ in Thousands
Jun. 15, 2018
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment      
Assets held for sale, net   $ 3,189 $ 0
Asset retirement obligation   3,800  
Land, buildings and improvements, net      
Property, Plant and Equipment      
Assets held for sale, net   $ 3,189 $ 0
Land, buildings and improvements, net | Industrial facility in Waldaschaff, Germany      
Property, Plant and Equipment      
Selling price $ 7,700