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Discontinued Operations, Assets Held for Sale and Impairments Real Estate Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Real Estate Assets [Abstract]    
Document Period End Date Dec. 31, 2019  
Investment Building and Building Improvements $ 5,295,336 $ 4,980,003
Land and Land Improvements 2,532,541 2,268,343
Real Estate Investments, Other 165,500 0
Real Estate Assets $ 7,993,377 $ 7,248,346