Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 73,862	$ 117,829
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	134,001	129,618
(Gain) loss on sale of property and equipment	(1,807)	12
Stock-based compensation expense related to stock options and employee stock purchases	15,463	15,803
Deferred income tax (benefit) expense	(11,597)	21,603
Change in accounts receivable, net	28,027	(29,153)
Change in inventories, net	439,226	5,709
Change in prepaid expenses and other, net	7,413	(13,928)
Change in trade accounts payable	(24,883)	9,848
Payments on floor plan notes payable – trade, net	(62,329)	(14,148)
Change in customer deposits	(6,111)	(2,630)
Change in accrued expenses	2,985	(18,715)
Other, net	(3,781)	(227)
Net cash provided by operating activities	590,469	221,621
Cash flows from investing activities:
Acquisition of property and equipment	(107,839)	(230,595)
Proceeds from the sale of property and equipment	5,663	2,100
Business acquisitions	0	(10,168)
Purchase of equity method investment and call option	0	(22,499)
Change in other assets	3,278	2,412
Net cash used in investing activities	(98,898)	(258,750)
Cash flows from financing activities:
(Payments) draws on floor plan notes payable – non-trade, net	(320,307)	42,370
Proceeds from long-term debt	139,870	162,039
Draws on line of credit	0	135,000
Principal payments on long-term debt	(202,690)	(141,844)
Principal payments on finance lease obligations	(9,539)	(7,508)
Payments on line of credit	0	(135,000)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	16,103	4,536
Payments of cash dividends	(14,680)	(13,578)
Common stock repurchased	(22,405)	(53,764)
Debt issuance costs	0	(731)
Net cash used in financing activities	(413,648)	(8,480)
Net increase (decrease) in cash and cash equivalents	77,923	(45,609)
Cash and cash equivalents, beginning of period	181,620	131,726
Cash and cash equivalents, end of period	259,543	86,117
Supplemental disclosure of cash flow information:
Interest	31,153	43,909
Income taxes, net of refunds	26,934	41,197
Assets acquired under finance leases	34,839	24,754
Common stock repurchased	246	435
Guaranty agreement	$ 0	$ 5,025