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Real Estate (Discontinued Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash flows provided by operating activities $ 5,702 $ 16,662
Cash flows used in investing activities (534) (7,972)
Ground Net Lease Business    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues 5,922 21,839
Expenses (1,491) (3,569)
Income from sales of real estate 508 0
Income from discontinued operations $ 4,939 $ 18,270