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Taxes (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning Unrecognized Tax Benefits $ 19,407 $ 23,110
Increases related to current tax positions 3,852 3,241
Decreases related to prior year tax positions (35) (1,271)
Foreign currency translation (decreases) increases to prior year tax positions (34) (103)
Decrease relating to taxing authority settlements (83) (5,558)
Decreases resulting from a lapse of the applicable statue of limitations (2,957) (12)
Ending Unrecognized Tax Benefits $ 20,150 $ 19,407