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Notes And Other Receivables Notes and Other Receivables, Installment notes receivable on manufactured homes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and Financing Receivable, after Allowance for Credit Loss $ 186,692 $ 157,926  
Notes Receivable, Fair Value Adjustment $ 0 100  
Document Period End Date Mar. 31, 2020    
Installment notes receivable on manufactured homes, net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and Financing Receivable, after Allowance for Credit Loss   $ 95,600  
Loans and Leases Receivable, Allowance $ (600)    
Receivable with Imputed Interest, Effective Yield (Interest Rate) 8.00% 8.00%  
Receivable With Imputed Interest, Term 15 years 7 months 6 days 15 years 9 months 18 days  
Reported Value Measurement [Member] | Installment notes receivable on manufactured homes, net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and Financing Receivable, after Allowance for Credit Loss   $ 95,580  
Fair Value, Recurring [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes Receivable, Fair Value Adjustment $ (2,100)    
Fair Value, Recurring [Member] | Installment notes receivable on manufactured homes, net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes Receivable, Fair Value Adjustment (1,100) 1,000  
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes Receivable, Fair Value Adjustment   0  
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Installment notes receivable on manufactured homes, net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and Financing Receivable, after Allowance for Credit Loss 92,208 95,580  
Notes Receivable, Fair Value Adjustment   $ 0 $ 0
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Installment notes receivable on manufactured homes, net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and Financing Receivable, after Allowance for Credit Loss $ 92,208