Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 14,479,000	$ 2,395,000
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation and amortization	38,724,000	39,073,000
Loss (gain) on sale of property and equipment, net	163,000	(10,000)
Loss on impairment of assets		7,718,000
Stock-based compensation expense related to employee stock options and employee stock purchases	4,759,000	3,597,000
Provision for deferred income tax expense	1,408,000	(7,585,000)
Excess tax expense from stock-based compensation		1,007,000
Change in accounts receivable, net	(12,901,000)	5,340,000
Change in inventories	(19,376,000)	49,921,000
Change in prepaid expenses and other, net	(609,000)	21,384,000
Change in trade accounts payable	1,690,000	(16,520,000)
Draws (payments) on floor plan notes payable – trade, net	18,552,000	(1,789,000)
Change in customer deposits	(2,201,000)	2,274,000
Change in accrued expenses	(7,163,000)	(5,567,000)
Net cash provided by operating activities	37,525,000	101,238,000
Cash flows from investing activities:
Acquisition of property and equipment	(39,209,000)	(53,880,000)
Proceeds from the sale of property and equipment	1,600,000	616,000
Other	5,160,000	676,000
Net cash used in investing activities	(32,449,000)	(52,588,000)
Cash flows from financing activities:
Draws (payments) on floor plan notes payable – non-trade, net	19,098,000	(26,982,000)
Proceeds from long-term debt	25,555,000	32,194,000
Principal payments on long-term debt	(38,113,000)	(42,503,000)
Principal payments on capital lease obligations	(3,337,000)	(4,853,000)
Issuance of shares relating to employee stock options and employee stock purchases	6,851,000	2,315,000
Excess tax expense from stock-based compensation		(1,007,000)
Common stock repurchased	(7,560,000)
Debt issuance costs	(523,000)
Net cash provided by (used in) financing activities	1,971,000	(40,836,000)
Net decrease in cash and cash equivalents	7,047,000	7,814,000
Cash and cash equivalents, beginning of period	82,026,000	64,847,000
Cash and cash equivalents, end of period	89,073,000	72,661,000
Supplemental disclosure of cash flow information:
Interest	8,211,000	10,265,000
Income taxes (refunded) paid, net	6,201,000	(15,015,000)
Noncash investing and financing activities:
Assets acquired under capital leases	$ 2,073,000	$ 7,580,000