Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 28,092,000	$ 56,240,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	118,149,000	106,506,000
Loss (gain) on sale of property and equipment	(1,571,000)	581,000
Asset Impairment Charges	8,247,000
Stock-based compensation expense related to stock options and employee stock purchases	9,426,000	9,889,000
Deferred income tax expense (benefit)	3,355,000	(4,097,000)
Excess tax expense from stock-based compensation	808,000	345,000
Change in accounts receivable, net	8,560,000	(39,054,000)
Change in inventories, net	199,228,000	(47,482,000)
Change in prepaid expenses and other, net	24,163,000	19,964,000
Change in trade accounts payable	(10,298,000)	27,187,000
Payments on floor plan notes payable – trade, net	(623,000)	(13,690,000)
Change in customer deposits	(6,560,000)	(23,336,000)
Change in accrued expenses	5,783,000	6,413,000
Net cash provided by operating activities	386,759,000	99,466,000
Cash flows from investing activities:
Acquisition of property and equipment	(159,546,000)	(250,211,000)
Proceeds from the sale of property and equipment	9,427,000	2,950,000
Business acquisitions	(681,000)	(65,116,000)
Proceeds from the sale of available for sale securities	450,000	275,000
Change in other assets	(4,520,000)	(3,302,000)
Net cash used in investing activities	(154,870,000)	(315,404,000)
Cash flows from financing activities:
(Payments) draws on floor plan notes payable – non-trade, net	(142,229,000)	95,055,000
Proceeds from long-term debt	103,248,000	115,169,000
Principal payments on long-term debt	(122,619,000)	(111,821,000)
Principal payments on capital lease obligations	(14,174,000)	(10,567,000)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	4,826,000	3,366,000
Excess tax benefit (expense) from stock-based compensation	(808,000)	(345,000)
Common stock repurchased	(33,282,000)	(1,464,000)
Net cash (used in) provided by financing activities	(205,038,000)	89,393,000
Net increase (decrease) in cash and cash equivalents	26,851,000	(126,545,000)
Cash and cash equivalents, beginning of period	64,847,000	191,463,000
Cash and cash equivalents, end of period	91,698,000	64,918,000
Cash paid during the period for:
Interest	29,172,000	26,261,000
Income taxes, net of refunds	(12,993,000)	12,131,000
Noncash investing activities:
Assets acquired under capital leases	$ 16,797,000	$ 31,317,000