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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 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 28, 2012
Other Expense [Member]
USD ($)
Sep. 30, 2011
Other Expense [Member]
USD ($)
Sep. 28, 2012
Other Expense [Member]
USD ($)
Sep. 30, 2011
Other Expense [Member]
USD ($)
Sep. 28, 2012
Foreign Exchange Contract Six [Member]
AUD
Dec. 31, 2011
Foreign Exchange Contract Six [Member]
AUD
Sep. 28, 2012
Foreign Exchange Contract Six [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contract Six [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Foreign Exchange Contract Six [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contract Six [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contract Six [Member]
Other Income [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contract Six [Member]
Other Income [Member]
USD ($)
Sep. 28, 2012
Foreign Exchange Contract Eight [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Contract Eight [Member]
USD ($)
Sep. 28, 2012
Foreign Exchange Contracts Nine [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contracts Nine [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Foreign Exchange Contracts Nine [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Contracts Nine [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Other Assets [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
USD ($)
Sep. 28, 2012
Other Assets [Member]
Foreign Exchange Contract Six [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
Foreign Exchange Contract Six [Member]
USD ($)
Sep. 28, 2012
Other Assets [Member]
Foreign Exchange Contract Eight [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
Foreign Exchange Contract Eight [Member]
USD ($)
Sep. 28, 2012
Other Liabilities [Member]
Foreign Exchange Contract Two [Member]
USD ($)
Feb. 12, 2009
Other Liabilities [Member]
Foreign Exchange Contract Two [Member]
AUD
Sep. 28, 2012
Other Liabilities [Member]
Foreign Exchange Contract Six [Member]
AUD
Sep. 28, 2012
Not Designated as Hedging Instrument [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Not Designated as Hedging Instrument [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Not Designated as Hedging Instrument [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Not Designated as Hedging Instrument [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contract Seven [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contract Seven [Member]
Other Expense [Member]
USD ($)
Sep. 28, 2012
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contract Seven [Member]
Other Expense [Member]
USD ($)
Sep. 30, 2011
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contract Seven [Member]
Other Expense [Member]
USD ($)
Feb. 12, 2009
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Foreign Exchange Contract Two [Member]
AUD
Derivative Instruments, Gain (Loss) [Line Items]                                                                        
Notional Amount of Foreign Currency Derivatives         3,408,000 9,816,000             $ 4,503,000 $ 5,481,000                                            
Derivative Liabilities                                                                       36,500,000
Foreign exchange contracts, Gain (Loss) Recognized in Income, Net 183,000 (764,000) 538,000 (39,000)     79,000 (835,000) 362,000 (110,000)         104,000 71,000 176,000 71,000                   0 0 0 (2,000) 0 0 0 (2,000)  
Foreign exhange contract, Other current assets                                             163,000 1,000                        
Foreign exchange contracts, Other current assets / Other assets                                     1,464,000 3,518,000 1,301,000 3,517,000                            
Derivative Instruments, Gain Recognized in Income                     1,100,000 800,000                                                
Due to the Commonwealth of Australia                                                 3,500,000 39,500,000 3,400,000                  
Other expense, net             $ 100,000   $ 200,000