Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 As Restated [Member]		Dec. 31, 2009 As Restated [Member]
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income before income taxes	$ 102,619	$ (1,921)		$ 44,761
Income tax at federal statutory rate	35,917	(672)		15,666
Research and development credits	(803)	(1,115)		(795)
Meals, entertainment and other non-deductible expenses	2,344	1,183		772
State income taxes, net of federal benefit	1,937	105		1,689
Section 199 deduction	0	(532)		(554)
Foreign tax rate differential	(1,132)	(1,371)		(531)
Benefit of litigation settlement	(13,809)	0		0
Interest and penalties on uncertain tax positions	155	(1,679)		(59)
Uncertain tax positions	(4,331)	(1,299)		2,035
Transaction costs	0	1,114		0
Change in valuation allowance	808	0		(1,283)
Other, net	(1,155)	204		246
Income tax provision	$ 19,931	$ (4,062)	[1]	$ 17,186	[1]
Effective tax rate (percentage)	19.40%	211.50%		38.40%

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.