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Real Estate (Other Dispositions) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
 [1]
Jun. 30, 2017
USD ($)
 [1]
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income from sales of real estate $ 24,500 $ 56,895 $ 844 $ 73,943 [1] $ 8,954 [1]
Operating Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Real Estate Properties Sold | property       4  
Proceeds       $ 196,200 17,600
Income from sales of real estate       $ 49,000 2,700
Operating Properties, Noncontrolling Interest          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Real Estate Properties Sold | property       1  
Income from sales of real estate       $ 9,800  
Net Lease          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Real Estate Properties Sold | property       3  
Proceeds       $ 38,400 19,500
Income from sales of real estate       24,900 6,200
Total          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds       234,600 37,100
Income from sales of real estate       $ 73,900 $ 8,900
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations