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Reserve for Severance Activity in reserve (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reserve for severance and related payments      
Balance at end of the period $ 4,417 $ 1,282  
Employee Severance [Member]
     
Reserve for severance and related payments      
Balance at beginning of period 1,282 3,062 4,086
Charged to earnings current year 8,021 1,614 3,629
Cash paid and exchange rate variance 4,886 3,394 4,653
Balance at end of the period $ 4,417 $ 1,282 $ 3,062