Debt MIF Warehousing Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Nov. 15, 2020	Sep. 25, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Maximum Borrowing Availability under all Credit Lines	$ 275,000			$ 225,000
Notes payable bank - financial services operations	$ 225,634			$ 136,904
Warehousing Agreement - Fourth Amendment to Second Amended and Restated [Member]
Line of Credit Facility [Line Items]
Basis Point Spread on Variable Rate	2.00%
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000	$ 185,000	$ 160,000
libor floor	1.00%
Line of Credit Facility, Expiration Date	May 28, 2021
Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 90,000
libor floor	1.00%
Line of Credit Facility, Expiration Date	Oct. 25, 2021
Minimum [Member] | Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Line of Credit Facility [Line Items]
Basis Point Spread on Variable Rate	1.75%
Maximum [Member] | Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]
Line of Credit Facility [Line Items]
Basis Point Spread on Variable Rate	2.00%