Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Net income	$ 18,940	$ 25,485
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	19,123	13,864
Share-based compensation expense	2,597	2,642
Provision for losses on accounts and notes receivable	220	54
Deferred income tax expense (benefit)	510	(822)
Changes in operating assets and liabilities:
Accounts and notes receivable	27,356	29,828
Merchandise inventories	(3,888)	3,707
Accounts payable	88,944	15,815
Net change in other assets and liabilities	13,580	3,921
Other, net	1,321	(1,292)
Cash provided by operating activities	168,703	93,202
Investing activities:
Additions to property and equipment	(7,619)	(7,299)
Payments to Acquire Software	3,947	6,930
Proceeds from sale of investment	0	1,937
Proceeds from sale of property and equipment	50	105
Cash used for investing activities	(11,516)	(12,187)
Financing activities:
Change in bank overdraft	1,179	20,578
Repayment of revolving credit facility	(33,700)	0
Cash dividends paid	(15,934)	(15,785)
Repurchases of common stock	0	(5,000)
Excess tax benefits related to share-based compensation	240	346
Proceeds from exercise of stock options	125	937
Other, net	(2,324)	(1,868)
Cash used for financing activities	(50,414)	(792)
Effect of exchange rate changes on cash and cash equivalents	(4,489)	245
Net increase in cash and cash equivalents	102,284	80,468
Cash and cash equivalents at beginning of period	56,772	101,905
Cash and cash equivalents at end of period	159,056	182,373
Supplemental disclosure of cash flow information:
Income taxes paid, net	4,509	15,161
Interest paid	$ 5,924	$ 539