Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Schedule of Accrued Liabilities) (Details)

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Accrued Liabilities (Schedule of Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accrued Liabilities, Current [Abstract]        
Accrued salaries, bonus, vacation and other benefits $ 55,728 $ 55,958    
Accrued import duties 15,023 11,258    
Product warranties 10,209 10,452 10,256 12,112
Other 24,230 26,828    
Accrued liabilities, total $ 105,190 $ 104,496