Derivative Financial Instruments Derivatives Not Designated as Hedging Instruments (Details)													3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 27, 2013 Foreign Exchange Contract Six [Member] AUD	Dec. 31, 2012 Foreign Exchange Contract Six [Member] AUD	Sep. 27, 2013 Foreign Exchange Contract Eight [Member] USD ($)	Dec. 31, 2012 Foreign Exchange Contract Eight [Member] USD ($)	Sep. 27, 2013 Other Assets [Member] USD ($)	Dec. 31, 2012 Other Assets [Member] USD ($)	Sep. 27, 2013 Other Assets [Member] Foreign Exchange Contract Six [Member] USD ($)	Dec. 31, 2012 Other Assets [Member] Foreign Exchange Contract Six [Member] USD ($)	Sep. 27, 2013 Other Assets [Member] Foreign Exchange Contract Eight [Member] USD ($)	Dec. 31, 2012 Other Assets [Member] Foreign Exchange Contract Eight [Member] USD ($)	Feb. 12, 2009 Other Liabilities [Member] Foreign Exchange Contract Two [Member] AUD	Feb. 12, 2009 Other Liabilities [Member] Not Designated as Hedging Instrument [Member] Foreign Exchange Contract Two [Member] AUD	Sep. 27, 2013 Assets [Member] Foreign Exchange Contract Six [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Foreign Exchange Contract Six [Member] Other Expense [Member] USD ($)	Sep. 27, 2013 Assets [Member] Foreign Exchange Contract Six [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Foreign Exchange Contract Six [Member] Other Expense [Member] USD ($)	Sep. 27, 2013 Assets [Member] Foreign Exchange Contract Eight [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Foreign Exchange Contract Eight [Member] Other Expense [Member] USD ($)	Sep. 27, 2013 Assets [Member] Foreign Exchange Contract Eight [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Foreign Exchange Contract Eight [Member] Other Expense [Member] USD ($)	Sep. 27, 2013 Assets [Member] Derivative Financial Instruments, Assets [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Derivative Financial Instruments, Assets [Member] Other Expense [Member] USD ($)	Sep. 27, 2013 Assets [Member] Derivative Financial Instruments, Assets [Member] Other Expense [Member] USD ($)	Sep. 28, 2012 Assets [Member] Derivative Financial Instruments, Assets [Member] Other Expense [Member] USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Notional Amount	0	3,408,000	$ 2,829,000	$ 4,110,000
Foreign exchange contracts, Other current assets / Other assets					114,000	1,506,000	0	1,345,000
Foreign exhange contract, Other current assets									114,000	161,000
Derivative Liabilities												36,500,000
Due to the Commonwealth of Australia											39,500,000
Foreign exchange contracts, Gain (Loss) Recognized in Income, Net													$ 0	$ 79,000	$ 0	$ 362,000	$ (136,000)	$ 104,000	$ 47,000	$ 176,000	$ (136,000)	$ 183,000	$ 47,000	$ 538,000