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Combined Guarantor Subsidiary - Noncash Investing and Financing Activities - Summary (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Real Estate Investments, Net [Abstract]      
Additions to real estate assets accrued but not yet paid $ 19,757 $ 2,071  
Lease liabilities arising from obtaining right-of-use assets 4,024 0 $ 4,074
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Decrease in real estate assets (60,059) 0  
Decrease in mortgage and other indebtedness 124,111 0  
Decrease in operating assets and liabilities 9,333 0  
Decrease in intangible lease and other assets (1,663) 0  
Guarantor Subsidiaries      
Real Estate Investments, Net [Abstract]      
Additions to real estate assets accrued but not yet paid 2,583 6,024  
Distribution of properties to owners 8,835 0  
Lease liabilities arising from obtaining right-of-use assets 490 0 $ 490
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Decrease in real estate assets (60,058) 0  
Decrease in mortgage and other indebtedness 115,271 0  
Decrease in operating assets and liabilities 8,246 0  
Decrease in intangible lease and other assets $ (1,663) $ 0