Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 45,333	$ 23,107
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation and amortization	42,601	45,192
Gain on sale of property and equipment, net	(92)	(100)
Stock-based compensation expense related to employee stock options and employee stock purchases	11,520	8,553
Provision for deferred income tax expense	(8,375)	(7,160)
Change in accounts receivable, net	(14,690)	(30,893)
Change in inventories	(1,797)	153,569
Change in prepaid expenses and other, net	(729)	6,002
Change in trade accounts payable	23,903	(11,673)
Payments on floor plan notes payable – trade, net		(15,077)
Change in customer deposits	(31,243)	(16,701)
Change in accrued expenses	(25,495)	(15,257)
Other, net	(795)	(747)
Net cash provided by operating activities	40,141	138,815
Cash flows from investing activities:
Acquisition of property and equipment	(32,933)	(49,489)
Proceeds from the sale of property and equipment	136	172
Other	638	1,984
Net cash used in investing activities	(32,159)	(47,333)
Cash flows from financing activities:
Draws (payments) on floor plan notes payable – non-trade, net	38,518	(92,579)
Proceeds from long-term debt	20,125	28,226
Principal payments on long-term debt	(44,669)	(45,450)
Principal payments on finance lease obligations	(2,090)	(2,012)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	631	909
Payments of cash dividends	(9,914)	(4,754)
Common stock repurchased	(6,561)	(19,902)
Net cash used in financing activities	(3,960)	(135,562)
Net increase (decrease) in cash and cash equivalents	4,022	(44,080)
Cash and cash equivalents, beginning of period	312,048	181,620
Cash and cash equivalents, end of period	316,070	137,540
Supplemental disclosure of cash flow information:
Interest	7,262	12,556
Income taxes paid (refunded), net	27,552	(2)
Assets acquired under finance leases	$ 10,368	$ 12,673