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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Value-added tax assessments and other civil litigation
   
Commitments and contingencies    
Future payments related to value-added tax assessments and other civil litigation, minimum $ 0  
Future payments related to value-added tax assessments and other civil litigation, maximum 1,000  
Minimum number of claims that the Company's insurance coverage may not be sufficient to cover 1  
Non-income Tax Contingencies
   
Commitments and contingencies    
Accrued liabilities related to non-income tax contingencies $ 6,580 $ 6,921