Finance Receivables - Activity in allowance for credit losses (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	$ 2,165	$ 1,675	$ 1,395	$ 730	$ 250	$ 650	$ 3,050	$ 3,300	$ 5,965	$ 7,250
Finance receivables
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year				6,154				11,162	6,154	11,162
Provision for credit losses									5,965	7,250
Charge-offs									(14,495)	(17,823)
Recoveries									5,325	5,565
Balance at end of year	2,949				6,154				2,949	6,154
Finance receivables | Indirect
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year				6,001				10,433	6,001	10,433
Provision for credit losses									4,210	7,250
Charge-offs									(13,515)	(17,141)
Recoveries									5,265	5,459
Balance at end of year	1,961				6,001				1,961	6,001
Finance receivables | Direct
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year				$ 153				$ 729	153	729
Provision for credit losses									1,755	0
Charge-offs									(980)	(682)
Recoveries									60	106
Balance at end of year	$ 988				$ 153				$ 988	$ 153