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Notes Payable to Related Parties - Additional Information (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Note
Jan. 31, 2018
USD ($)
Note
Mar. 31, 2019
USD ($)
Note
Mar. 31, 2018
USD ($)
Note
Related Party Transaction [Line Items]        
Debt instrument, base interest rates     5.00%  
Interest expense related parties | $     $ 0 $ 2,079,000
Warehouse Notes        
Related Party Transaction [Line Items]        
Number of notes issued | Note     10  
Notes issued during the year | $     $ 45,000,000  
Repayment on notes | $ $ 225,000,000 $ 50,000,000    
Number of notes repaid in full | Note   3    
Number of notes repaid in part | Note   1    
Number of notes outstanding | Note 26     26
Notes issued outstanding amount | $     $ 0  
Warehouse Notes | Maximum        
Related Party Transaction [Line Items]        
Accrued interest rate maturity period     1 year  
Warehouse Notes | Maximum | LIBOR        
Related Party Transaction [Line Items]        
Debt instrument, base interest rates     2.76%  
Warehouse Notes | Eldridge Industries, LLC | Minimum [Member] | LIBOR        
Related Party Transaction [Line Items]        
Debt instrument, base interest rates     2.14%