Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 125,645	$ 113,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,920	10,749
Amortization	771	1,075
Share-based compensation	7,112	6,854
Excess tax benefits from share-based compensation	(4,916)	(4,141)
Equity earnings in unconsolidated investments	(259)	(209)
Other	2,314	2,495
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	(78,662)	(79,891)
Product inventories	52,463	19,262
Prepaid expenses and other assets	296	(1,212)
Accounts payable	(66,035)	(61,544)
Accrued expenses and other current liabilities	27,334	30,773
Net cash provided by operating activities	77,983	37,220
Investing activities
Acquisition of businesses, net of cash acquired	(602)	(9,381)
Purchase of property and equipment, net of sale proceeds	(21,299)	(14,687)
Payments to fund credit agreement	(6,300)	0
Collections from credit agreement	4,557	0
Other investments, net	75	133
Net cash used in investing activities	(23,569)	(23,935)
Financing activities
Proceeds from revolving line of credit	721,835	658,720
Payments on revolving line of credit	(690,677)	(542,018)
Proceeds from asset-backed financing	128,400	121,600
Payments on asset-backed financing	(85,800)	(93,600)
Proceeds from short-term borrowings, long-term debt and other long-term liabilities	4,948	1,621
Payments on short-term borrowings, long-term debt and other long term liabilities	(4,678)	0
Payments of deferred financing costs	0	(7)
Excess tax benefits from share-based compensation	4,916	4,141
Proceeds from stock issued under share-based compensation plans	10,906	8,090
Payments of cash dividends	(32,008)	(28,075)
Purchases of treasury stock	(90,306)	(135,155)
Net cash used in financing activities	(32,464)	(4,683)
Effect of exchange rate changes on cash and cash equivalents	(7,276)	(2,153)
Change in cash and cash equivalents	14,674	6,449
Cash and cash equivalents at beginning of period	14,830	8,006
Cash and cash equivalents at end of period	$ 29,504	$ 14,455