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Debt (Details)
 0 Months Ended 12 Months Ended 50 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 17, 2010
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CHF
Jan. 01, 2011
USD ($)
Jan. 02, 2010
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Feb. 29, 2012
Bank Of America, N.A. Seoul Branch [Member]
Jan. 31, 2012
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Apr. 06, 2011
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Dec. 17, 2010
Credit Agreement [Member]
USD ($)
Dec. 31, 2011
Credit Agreement [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2011
Swingline [Member]
USD ($)
Dec. 17, 2010
Swingline [Member]
USD ($)
Dec. 31, 2011
Prime Rate [Member]
Dec. 31, 2011
Federal Funds Rate [Member]
Dec. 31, 2011
LIBOR [Member]
USD ($)
Dec. 31, 2011
Base Rate [Member]
USD ($)
Dec. 31, 2011
Short-Term Credit Facilities [Member]
USD ($)
Jan. 01, 2011
Short-Term Credit Facilities [Member]
USD ($)
Jan. 02, 2010
Short-Term Credit Facilities [Member]
USD ($)
Feb. 22, 2012
Short-Term Credit Facilities [Member]
USD ($)
Nov. 25, 2009
Short-Term Credit Facilities [Member]
JPY (¥)
Feb. 07, 2011
Letter Of Credit Facility [Member]
USD ($)
Dec. 17, 2010
Revolving Credit Loans [Member]
USD ($)
Dec. 31, 2011
Leverage Ratio Less Than One To One [Member]
Credit Agreement Interest Rate Option One [Member]
Dec. 31, 2011
Leverage Ratio Less Than One To One [Member]
Credit Agreement Interest Rate Option Two [Member]
Dec. 31, 2011
Leverage Ratio Greater Than Or Equal To Two To One [Member]
Credit Agreement Interest Rate Option Two [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Minimum [Member]
Bank Of America, N.A. Seoul Branch [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Maximum [Member]
Bank Of America, N.A. Seoul Branch [Member]
Debt Instrument [Line Items]                                                                  
Credit agreement term, years 3 years                                                                
Loan amount                             $ 20,000,000                   $ 60,000,000 $ 300,000,000              
Line of credit expiration date   December 17, 2013 December 17, 2013       March 21, 2012                         May 22, 2012                          
Percentage of total outstanding voting capital stock   65.00% 65.00%                                                            
Percentage of total outstanding non-voting capital stock   100.00% 100.00%                                                            
Credit agreement payment of upfront fees                     1,200,000                                            
Interest rate               4.75% 4.75% 3.55%           3.25%   0.30%     1.475%   1.475%                    
Debt instrument basis spread on variable rate                                 1.50% 1.50%                         120.00%   130.00%
Leverage ratio percentage                                                     0.25% 1.25% 2.00%        
Maximum consolidated leverage ratio, numerator   2.50 2.50     2.50                                                      
Unused commitment fee percentage                                                           0.20%   0.35%  
Letters of credit outstanding   36,900,000   37,200,000   36,900,000           598,000                         40,000,000                
Interest payments due           quarterly                                                      
Minimum principal amounts   107,000 100,000                   3,000,000 100,000       5,000,000 2,000,000                            
Debt instrument increments in excess of minimum principal amount                         1,000,000 100,000       1,000,000 1,000,000                            
Available borrowings under the Revolver   299,100,000       299,100,000                                                      
Interest expense   82,000   76,000 76,000                                                        
Consolidated tangible net worth   600,000,000                                                              
Percentage of positive consolidated net income   25.00% 25.00%                                                            
Maximum capital expenditures subject to adjustments   125,000,000                                                              
Line of credit facility amount outstanding             6,000,000   6,200,000                     2,600,000 4,900,000   3,800,000                    
Amounts outstanding under the FGE Note   3,800,000   3,900,000   3,800,000                                                      
Total long-term borrowings outstanding   6,236,000   4,513,000   6,236,000                                                      
Short-term credit facility agreement                   20,000,000                           400,000,000                  
Interest expense related to short term borrowings   265,000                                   46,000 61,000 61,000                      
Variable interest rate       2.00%                                                          
Current capital lease obligations   300,000   300,000   300,000                                                      
Long-term capital lease obligations outstanding   $ 2,500,000   $ 700,000   $ 2,500,000