Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 68,825	$ 124,246	$ 85,122
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	28,013	26,839	27,967
Amortization	9,594	10,225	13,231
Share-based compensation expense	9,881	7,519	7,588
Impairment of equity investments			2,164
Deferred tax valuation allowance	358	(41,038)	(13,600)
Provision for deferred income taxes	11,582	21,671	10,647
Charge for excess and obsolete inventory	4,007	3,167	998
Excess tax benefit from share-based compensation plans	(3,805)	(657)	(149)
Amortization of debt issuance costs		676	1,731
Net income attributable to noncontrolling interest		(400)	(766)
Other	1,701	(2,245)	(1,302)
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade accounts receivable and notes receivable	10,626	19,336	(26,789)
Inventories	(6,118)	3,632	(14,285)
Accounts payable and accrued liabilities	6,265	(15,127)	34,860
Other current assets	(2,985)	1,253	(283)
Income taxes payable and refundable income taxes	(11,015)	(433)	13,243
Other	(11,767)	(1,378)	521
Net cash provided by operating activities	115,162	157,286	140,898
Investing activities:
Acquisition of property and equipment	(49,929)	(30,267)	(16,794)
Purchase of short-term investments	(27,990)	(2,047)
Proceeds from sale or maturities of short-term investments	8,000	2,000
Other	(2,548)	1,883	4,809
Net cash used in investing activities	(72,467)	(28,431)	(11,985)
Financing activities:
Principal payments on short-term borrowings and long-term debt			(259,157)
Proceeds from short-term borrowings and long-term debt			186,649
Issuance of common stock from employee stock plans	7,431	11,690	6,799
Other	3,459	(826)
Net cash provided by (used in) financing activities	10,890	10,864	(65,709)
Effect of exchange rate changes on cash and cash equivalents	3,241	(80)	2,050
Increase in cash and cash equivalents	56,826	139,639	65,254
Cash and cash equivalents at beginning of period	273,593	133,954	68,700
Cash and cash equivalents at end of period	330,419	273,593	133,954
Supplemental Cash Flow Information
Equipment purchases in accounts payable	3,429	1,372	517
Intangible assets received as partial consideration in sale of equity interest		1,712
Schedule of interest and income taxes paid:
Interest paid	271	210	2,072
Income taxes, net of refunds received	$ 29,697	$ 22,034	$ 3,592