Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Federal research and development tax credits		$ 4,800,000
Valuation Allowance, Amount	44,800,000
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense	11,600,000
Future Taxable Income to Recognize Deferred Tax Assets	217,034,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	12,005,000
Unrecognized Tax Benefits	48,022,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	34,174,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200,000
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Amount	31,500,000
Foreign Country [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Amount	13,300,000
AATI [Member]
Income Tax Examination [Line Items]
Unrecognized Tax Benefits	9,674,000
AATI [Member] | State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Amount	$ 5,500,000