Notes and Other Receivables, Schedule of installment notes receivable (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
Document Period End Date	Mar. 31, 2020
Notes Receivable, Fair Value Adjustment	$ 0	100
Receivable with Imputed Interest, Net Amount	92,200	95,600
Collateralized receivables, net and Installment Notes Receivables on Manufactured Homes [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase to reserve balance	600	0
Beginning balance	600	700
Ending balance	0	600
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
Notes due from Real Estate Developers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and Financing Receivable, after Allowance for Credit Loss	37,500	19,000
Installment notes receivable on manufactured homes, gross [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	96,200	113,500
Financed sales of manufactured homes	300	300
Principal payments and payoffs from our customers	(2,000)	(8,700)
Principal reduction from repossessed homes	1,200	8,900
Ending balance	93,300	96,200
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] | 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
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