Debt MIF Warehousing Agreement (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Nov. 15, 2021	Sep. 25, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Maximum Borrowing Availability under all Credit Lines		$ 265,000			$ 275,000
Notes payable bank - financial service operations		167,119			$ 225,634
Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 90,000
Line of Credit Facility, Expiration Date		Oct. 25, 2021
Libor Floor		1.00%
Warehousing Agreement - Fifth Amendment to Second Amended and Restated
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 175,000	$ 235,000	$ 210,000
Line of Credit Facility, Expiration Date		May 27, 2022
Basis point spread on variable rate under warehouse		1.90%
Libor Floor		0.50%
Banking Regulation Minimum Liquidity		$ 7,000
Minimum Net Worth Required for Compliance		$ 15,000
Warehousing Agreement - Fourth Amendment to Second Amended and Restated [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000
Basis point spread on variable rate under warehouse	2.00%
Libor Floor	1.00%
Banking Regulation Minimum Liquidity	$ 6,250
Minimum Net Worth Required for Compliance	$ 12,500
Minimum [Member] | Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Debt Instrument [Line Items]
Basis point spread on variable rate under warehouse		1.75%
Maximum [Member] | Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Debt Instrument [Line Items]
Basis point spread on variable rate under warehouse		2.00%