Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities
Net income	$ 4,188	$ 3,440
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	3,434	3,073
Amortization	328	321
Share-based compensation	2,058	1,905
Excess tax benefits from share-based compensation	(1,487)	(1,703)
Equity earnings in unconsolidated investments	(79)	(18)
Other	335	(38)
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	(85,018)	(74,283)
Product inventories	(97,032)	(94,786)
Prepaid expenses and other assets	(1,197)	(2,461)
Accounts payable	154,675	137,896
Accrued expenses and other current liabilities	(17,550)	(13,332)
Net cash used in operating activities	(37,345)	(39,986)
Investing activities
Acquisition of businesses, net of cash acquired	(4,512)	(325)
Purchase of property and equipment, net of sale proceeds	(5,870)	(4,882)
Other investments, net	49	9
Net cash used in investing activities	(10,333)	(5,198)
Financing activities
Proceeds from revolving line of credit	184,988	149,760
Payments on revolving line of credit	(163,549)	(102,100)
Proceeds from asset-backed financing	66,569	0
Payments on asset-backed financing	(10,200)	0
Payments on long-term debt and other long-term liabilities	0	(5)
Excess tax benefits from share-based compensation	1,487	1,703
Proceeds from stock issued under share-based compensation plans	5,231	6,438
Payments of cash dividends	(8,569)	(7,434)
Purchases of treasury stock	(28,168)	(3,829)
Net cash provided by financing activities	47,789	44,533
Effect of exchange rate changes on cash and cash equivalents	(860)	1,061
Change in cash and cash equivalents	(749)	410
Cash and cash equivalents at beginning of period	8,006	12,463
Cash and cash equivalents at end of period	$ 7,257	$ 12,873