Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 29, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Expense (Benefit)	$ 15,625		$ (12,672)	$ 17,774	$ (14,467)
Effective Income Tax Rate, Continuing Operations	116.10%		32.20%	59.80%	45.30%
Effective Income Tax Rate Reconciliation, At Federal Statutory Income Tax Rate				35.00%
Reversal Of Deferred Tax Liability Relating To Investment In Foreign Subsidiaries		1,934
Deferred Income Tax Expense (Benefit)	102			102
Effect of Goodwill and Change in Future Deferred State Taxes [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Expense (Benefit)	$ 14,183