Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 26, 2016
Unconsolidated VIEs
Movement in Valuation Allowances and Reserves [Roll Forward]
Principal balance of finance receivable				$ 301,800
Accounts receivable – allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	$ 2,741	$ 2,905	$ 3,458
Provision charged to expense	1,328	(101)	266
Reserve adjustments	99	(63)	(276)
Write-offs, net of recoveries	(77)	0	(543)
Balance, end of period	4,091	2,741	2,905
Finance receivables – allowance for credit losses
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	173,343	147,178	127,364
Provision charged to expense	(132,444)	(136,617)	(101,345)
Write-offs, net of recoveries	(113,316)	(107,161)	(81,531)
Other	0	(3,291)	0
Balance, end of period	192,471	173,343	147,178
Inventories – allowance for obsolescence
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	39,873	26,740	17,775
Provision charged to expense	(16,940)	(21,137)	(19,564)
Reserve adjustments	306	(88)	(1,028)
Write-offs, net of recoveries	(18,450)	(7,916)	(9,571)
Balance, end of period	38,669	39,873	26,740
Deferred tax assets – valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period	30,953	20,659	25,462
Reserve adjustments	(9,392)	10,294	(4,803)
Balance, end of period	$ 21,561	$ 30,953	$ 20,659