Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts receivable - Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	$ 4,007	$ 4,091	$ 2,741
Provision charged to expense	(1,569)	(731)	(1,328)
Reserve adjustments	7	(137)	99
Write-offs, net of recoveries	(655)	(678)	(77)
Balance, end of period	4,928	4,007	4,091
Finance receivables - Allowance for credit losses
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	189,885	192,471	173,343
Provision charged to expense	(134,536)	(106,870)	(132,444)
Write-offs, net of recoveries	(125,840)	(109,456)	(113,316)
Balance, end of period	198,581	189,885	192,471
Inventories – allowance for obsolescence
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	39,015	38,669	39,873
Provision charged to expense	(24,984)	(25,722)	(16,940)
Reserve adjustments	(39)	(332)	306
Write-offs, net of recoveries	(14,611)	(25,044)	(18,450)
Balance, end of period	49,349	39,015	38,669
Deferred tax assets - Valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	21,868	21,561	30,953
Reserve adjustments	7,156	307	(9,392)
Balance, end of period	$ 29,024	$ 21,868	$ 21,561