Summary of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Table Text Block]

	Year Ended December 31,
	2011		2010		2009

Basic
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,202		44,146		42,237

Net income attributable to common stockholders	$	50,737	$	76,733	$	7,513

Basic earnings per share attributable
to common stockholders	$	1.12	$	1.74	$	0.18

Diluted
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,202		44,146		42,237

Add: Assumed exercise of stock options and stock awards		1,511		1,400		1,212

Weighted average number of common shares outstanding
used in computing diluted earnings per share		46,713		45,546		43,449

Net income attributable to common stockholders	$	50,737	$	76,733	$	7,513
Diluted earnings per share attributable
to common stockholders	$	1.09	$	1.68	$	0.17

Comprehensive Income [Abstract]

Schedule Of Comprehensive Income Loss [Table Text Block]

	Twelve Months Ended December 31,
	2011	2010	2009
Net income	$ 53,507	$ 80,264	$ 9,848

Translation adjustment	(690)	(1,519)	7,963

Unrealized gain (loss) on defined benefit plan, net of tax	10,008	4,750	(12,346)

Foreign currency gain (loss) on forward contracts, net of tax	-	-	4,511

Comprehensive income	62,825	83,495	9,976

Less: Comprehensive income attributable to noncontrolling interest	(2,770)	(3,531)	(2,335)

Total comprehensive income attributable to common stockholders	$ 60,055	$ 79,964	$ 7,641

Schedule Of Accumulated Other Comprehensive Income Loss [Table Text Block]

	2011	2010
Translation adjustment	$ (29,919)	$ (29,230)

Unrealized loss on defined benefit plan, net of tax	$ (5,843)	$ (15,850)

- Definition

Tabular disclosure of components of comprehensive income (loss) including, but not limited to: (a) foreign currency translation adjustments; (b) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (c) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (d) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (e) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (f) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (g) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans.

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