Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities Accrued Liabilities (Schedule of Accrued Liabilities) (Details)

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Accrued Liabilities Accrued Liabilities (Schedule of Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued Liabilities, Current [Abstract]        
Accrued salaries, bonus, vacation and other benefits $ 68,046 $ 55,728    
Accrued import duties 10,594 15,023    
Product warranties 10,768 10,209 10,452 10,256
Other 30,989 24,230    
Accrued liabilities, total $ 120,397 $ 105,190