Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 19,785	$ 7,925
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,108	21,312
Gain on sale of property and equipment	(419)	(36)
Stock-based compensation expense related to stock options and employee stock purchases	3,874	2,902
Provision for deferred income tax expense	8,824	570
Excess tax benefits from stock-based compensation	(1,145)	(209)
Change in accounts receivable, net	(26,966)	(11,354)
Change in inventories	(93,554)	(43,902)
Change in prepaid expenses and other, net	6,801	743
Change in trade accounts payable	10,985	16,084
Change in accrued expenses	9,696	11,451
Net cash (used in) provided by operating activities	(36,011)	5,486
Cash flows from investing activities:
Acquisition of property and equipment	(60,805)	(28,558)
Proceeds from the sale of property and equipment	10,474	123
Business acquisitions	(60,038)	(32,450)
Change in other assets	537	(1,996)
Net cash used in investing activities	(109,832)	(62,881)
Cash flows from financing activities:
Draws on floor plan notes payable, net	114,741	44,504
Proceeds from long-term debt	45,943	26,854
Principal payments on long-term debt	(33,252)	(24,806)
Principal payments on capital lease obligations	(7,562)	(3,518)
Debt issuance costs	(41)	(73)
Excess tax benefits from stock-based compensation	1,145	209
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	2,178	909
Net cash provided by financing activities	123,152	44,079
Net decrease in cash and cash equivalents	(22,691)	(13,316)
Cash and cash equivalents, beginning of period	168,976	149,095
Cash and cash equivalents, end of period	146,285	135,779
Cash paid during the period for:
Interest	6,713	6,528
Income taxes, net of refunds	(3,396)	(3,147)
Noncash investing activities:
Assets acquired under capital leases	$ 6,903	$ 4,432