Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net Income	$ 74,849	$ 51,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,852	40,588
Deferred income tax provision (benefit)	1,911	(5,494)
Gain on sales of property and equipment	(1)	(94)
Noncash compensation	4,487	4,089
Proceeds from Equity Method Investment, Dividends or Distributions	(363)	(2,968)
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable	48,192	31,935
Inventory	(23,727)	(1,956)
Other operating assets	92	(72)
Currency translation effect on working capital	(10,431)	656
Current liabilities	(24,817)	19,802
Other long-term liabilities	(9)	2,562
Total adjustments to net income	45,912	94,984
Net Cash Provided by Operating Activities	120,761	146,439
Cash Flows from Investing Activities:
Purchases of property and equipment	(94,177)	(83,417)
Business acquisitions, net of cash acquired	0	(9,260)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	1,184	0
Dispositions of property and equipment and equity investment	24	355
Net Cash Used in Investing Activities	(92,969)	(92,322)
Cash Flows from Financing Activities:
Net payments of revolving credit facility, including new loan costs	(4,000)	(21,045)
Excess tax benefits from stock-based compensation	3,124	4,523
Cash dividends	(19,475)	(16,245)
Net Cash Provided by (Used in) Financing Activities	(20,351)	(32,767)
Net Increase (Decrease) in Cash and Cash Equivalents	7,441	21,350
Cash and Cash Equivalents-Beginning of Period	120,549	106,142
Cash and Cash Equivalents-End of Period	$ 127,990	$ 127,492