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Debt And Lines Of Credit , Narrative - Line of Credit (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2019
Line of Credit Facility [Line Items]        
Lines of credit   $ 183,898,000 $ 128,000,000  
Long-term Debt   3,442,282    
Weighted average interest rate 4.00%   4.50%  
Debt weighted average to maturity, length 11 years 1 month 6 days   9 years  
Line of credit - manufactured home floor plan facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit, borrowing capacity   12,000,000.0    
Lines of credit $ 3,300,000   $ 0  
Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Current Borrowing Capacity   750,000,000.0    
Line of credit, borrowing capacity   1,100,000,000    
Line of credit facility, additional borrowing capacity   350,000,000.0    
Letters of credit outstanding, amount $ 2,800,000   $ 3,900,000  
Long-term Debt   $ 183,898    
Prime Rate [Member] | Line of credit - manufactured home floor plan facility [Member]        
Line of Credit Facility [Line Items]        
Basis points   10000.00%    
Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of credit, borrowing capacity   $ 100,000,000.0    
Long-term Debt   0    
Term Loan [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.20%      
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit, borrowing capacity   650,000,000.0    
Lines of credit   183,898,000    
Long-term Debt $ 123,600,000      
Revolving Credit Facility [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Weighted average interest rate 2.70%   3.80%  
Debt weighted average to maturity, length 3 years 6 months   2 years 3 months 18 days  
Revolving Credit Facility [Member] | Term Loan [Member]        
Line of Credit Facility [Line Items]        
Lines of credit   $ 57,000,000.0   $ 58,000,000.0
Revolving Credit Facility [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.20%      
Minimum [Member] | Term Loan [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage   120.00%    
Minimum [Member] | Revolving Credit Facility [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage   120.00%    
Maximum [Member] | Prime Rate [Member] | Line of credit - manufactured home floor plan facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage 7.00% 6.00%    
Maximum [Member] | Term Loan [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage   205.00%    
Maximum [Member] | Revolving Credit Facility [Member] | Eurodollar [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage   210.00%    
GTSC [Member]        
Line of Credit Facility [Line Items]        
Line of credit, borrowing capacity   $ 125,000,000.0    
Long-term Debt   $ 49,400,000    
Equity Method Investment, Ownership Percentage   40.00%    
GTSC [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt   $ 123,400,000    
GTSC [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Basis points   1.65%