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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2017
USD ($)
Mar. 31, 2018
USD ($)
property
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net proceeds from sale of properties   $ 61,518 $ 90,823  
Number of real estate properties held for sale | property   0   1
Assets held for sale       $ 2,827
Real estate impairment charges   $ 53,049 2,698  
Asset impairment charges   53,049 7,992  
Impairment losses related to real estate partnerships $ 5,294      
Overland Park, Kansas [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset impairment charges   17,906    
Mortgage loans on real estate   32,591    
Amount in excess of fair value   19,366    
Memphis, Tennessee [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset impairment charges   25,433    
Transferred Property [Member] | Office Building [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Aggregate gross disposition price   62,675 92,756  
Sold Properties [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of properties   22,774 34,193  
LCIF [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net proceeds from sale of properties   2,101 3,889  
Asset impairment charges   22,730 2,497  
LCIF [Member] | Overland Park, Kansas [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset impairment charges   17,906    
Mortgage loans on real estate   32,591    
Amount in excess of fair value   19,366    
LCIF [Member] | Industrial Property [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net proceeds from sale of properties   2,300    
Loss (gain) on sale   $ (930)    
LCIF [Member] | Office Building [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net proceeds from sale of properties     4,130  
Loss (gain) on sale     $ 2,497