CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities:
Net income	$ 93,357	$ 89,045
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,699	29,236
Share-based compensation	5,935	7,526
Loss (gain) on the disposition of property, plant and equipment	97	(108)
Amortization of capitalized financing costs	657	687
Excess tax benefits related to share-based compensation	(1,166)	(3,223)
Deferred income taxes	(7,618)	(8,214)
Changes in operating assets and liabilities (net of acquisitions):
Increase in accounts receivable, net	(104,540)	(36,855)
Decrease in inventory	46,591	40,936
Decrease in other assets	10,000	1,612
Increase (decrease) in accounts payable	24,663	(24,677)
Decrease in checks in-transit	(2,679)	(835)
Increase (decrease) in accrued liabilities	3,438	(7,569)
Decrease in other liabilities	(4,768)	(8,120)
Net cash provided by operating activities	93,666	79,441
Cash Flows From Investing Activities:
Capital expenditures	(15,431)	(22,822)
Proceeds from the disposition of property, plant and equipment	872	3,522
Acquisition, net of cash acquired	(26,725)
Net cash used in investing activities	(41,284)	(19,300)
Cash Flows From Financing Activities:
Net repayments under revolving credit facility	(12,094)	(66,891)
Borrowings under Receivables Securitization Program	9,300	50,000
Repayment of debt	(135,000)
Proceeds from the issuance of debt	150,000
Net (disbursements) proceeds from share-based compensation arrangements	(3,142)	18,143
Acquisition of treasury stock, at cost	(43,037)	(46,984)
Payment of cash dividends	(16,407)	(16,764)
Excess tax benefits related to share-based compensation	1,166	3,223
Payment of debt issuance costs	(623)	(1,680)
Net cash used in financing activities	(49,837)	(60,953)
Effect of exchange rate changes on cash and cash equivalents	(33)	36
Net change in cash and cash equivalents	2,512	(776)
Cash and cash equivalents, beginning of period	22,326	30,919
Cash and cash equivalents, end of period	24,838	30,143
Other Cash Flow Information:
Income tax payments, net	55,867	60,342
Interest paid	$ 9,838	$ 9,806