Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net revenues	$ 170,744	[1]	$ 145,372	[1]
Cost of revenues	99,292		94,560
Gross profit	71,452		50,812
Selling, general and administrative expenses	26,946		24,623
Income from operations	44,506		26,189
Other income, principally interest	8,289		6,119
Income before income taxes	52,795		32,308
Income tax expense	12,050		7,259
Net income	40,745		25,049
Other Comprehensive Income, Net of tax
Foreign currency translation adjustments	16,012		3,036
Unrealized gains on securities:
Unrealized holding gains arising during period	272		229
Less: reclassification adjustment for gains included in net income	(177)		(192)
Unrealized gains on securities, Total	95		37
Defined benefit pension plans:
Net Profit / (loss) arising during period	(4)		10
Less: amortization of prior service cost included in net periodic pension cost	9
Defined benefit pension plans, Total	5		10
Other comprehensive income, before tax	16,112		3,083
Income tax expenses related to other comprehensive income	(31)		(2)
Other comprehensive income, net of tax	16,081		3,081
Comprehensive Income	$ 56,826		$ 28,130
Dividend per share	$ 0.06		$ 0.06
EARNINGS PER SHARE:
Basic	$ 0.98		$ 0.60
Diluted	$ 0.98		$ 0.60
Weighted average common shares outstanding:
Basic	41,653		41,579
Diluted	41,765		41,711

[1] Net revenues are attributed to regions based upon customer location.