Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income before income taxes, U.S.	$ 14,189,000	$ 6,930,000	$ 10,544,000
Income before income taxes, foreign	108,676,000	45,292,000	17,117,000
Income before income taxes	122,865,000	52,222,000	27,661,000
Current:
Income tax expense, federal	7,767,000	5,303,000	0
Income tax expense, state	395,000	551,000	483,000
Income tax expense, foreign	18,559,000	2,415,000	6,914,000
Total current income tax expense	26,721,000	8,269,000	7,397,000
U.S. deferred benefit	(6,266,000)	(9,001,000)	0
Foreign deferred benefit	(1,227,000)	(594,000)	(2,380,000)
Total income tax expense (benefit)	19,228,000	(1,326,000)	5,017,000
Income tax benefit relating to a reduction in the tax rate on intellectual property in the Netherlands	(12,400,000)
Release of valuation allowance and tax reserves		47,900,000
Release of valuation allowance and tax reserves recorded as benefit to shareholders' equity		12,500,000
Remaining release of valuation allowance and tax reserves after recording benefit to shareholders' equity		35,400,000
Tax expense for impact of new transfer pricing methodology in prior periods		18,100,000
Tax benefit from stock options exercised	2,900,000	12,100,000	0
Deferred tax (benefit) expense recorded in other comprehensive income	$ (3,000,000)	$ 400,000	$ 100,000