v2.4.0.6
Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt (Textual) [Abstract]      
Debt Outstanding $ 0 $ 0  
Feature of financial agreement Maximum borrowings of the lesser of $150.0 million or the amount of eligible accounts receivable plus the amount of eligible finished goods and raw materials, less any reserves established by the banks.    
Line of credit facility, accordion extension option 100,000,000    
Calculated maximum borrowings 150,000,000    
Calculated maximum borrowing amount available in current year 145,800,000    
Outstanding borrowings 0    
Total interest paid 313,000 322,000 522,000
Total interest capitalized $ 0 $ 0 $ 29,000
Prior Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Line of credit facility, interest rate description LIBOR plus a margin that varied from 1.0% to 1.75% depending upon the ratio of debt outstanding to adjusted earnings or (2) the base rate (which is the higher of the federal funds rate plus 0.5% or the prime rate) plus 0% to 0.25% (depending upon the ratio of debt outstanding to adjusted earnings).    
Base rate Higher of the federal funds rate plus 0.5% or the prime rate    
New Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Line of credit facility, interest rate description LIBOR plus a margin that varies from 0.875% to 1.75% depending upon the Leverage Ratio (as defined in the Credit Agreement), or (2) the base rate (which is the highest of the federal funds rate plus 0.5%, the prime rate, or LIBOR plus 1.0%) plus 0% to 0.25% (depending upon the Leverage Ratio)    
Base rate Highest of the federal funds rate plus 0.5%, the prime rate, or LIBOR plus 1.0%    
Minimum [Member] | Prior Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate 1.00%    
Percentage of commitment fee 0.20%    
Debt instrument basis spread on base rate 0.00%    
Minimum [Member] | New Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate 0.875%    
Percentage of commitment fee 0.15%    
Debt instrument basis spread on base rate 0.00%    
Maximum [Member] | Prior Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate 1.75%    
Percentage of commitment fee 0.375%    
Debt instrument basis spread on base rate 0.25%    
Maximum [Member] | New Credit Agreement [Member]
     
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate 1.75%    
Percentage of commitment fee 0.30%    
Debt instrument basis spread on base rate 0.25%