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Related Parties (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 30, 2020
May 04, 2020
May 03, 2020
Credit Facility | Revolving Credit Facility | Affiliated entity | Unsecured Management Company Revolver      
Related Party Transaction [Line Items]      
Maximum borrowing capacity $ 30,000 $ 50,000 $ 30,000
Investments in Majority-owned Subsidiaries      
Related Party Transaction [Line Items]      
Shares redeemed for a promissory note (in shares) 105,030    
Investments in Majority-owned Subsidiaries | Debt Investments      
Related Party Transaction [Line Items]      
Redemption of shares paid-in-kind $ 11,315    
Interest rate 7.00%    
Common Stock | NMNLC      
Related Party Transaction [Line Items]      
Sale of stock, number of shares issued (in shares) 105,030    
Sale of stock, price per share (in dollars per share) $ 107.73    
Sale of stock, consideration received $ 11,315