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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 Value-added tax assessments and other civil litigation item | Sep. 30, 2013 Non-income Tax Contingencies | Dec. 31, 2012 Non-income Tax Contingencies
Commitments and contingencies |  |  |
Minimum number of claims that the Company's insurance coverage may not be sufficient to cover | 1 |  |
Accrued liabilities |  | $ 5,465 | $ 6,207
Provision for losses | 0 |  |
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 | $ 900 |  |

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