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Commitments and Contingencies (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Summary of total maximum amount of financial guarantees issued  
2015 $ 191,015nbr_GuaranteeObligationsMaximumExposureInYearOne
2016 75nbr_GuaranteeObligationsMaximumExposureInYearTwo
2017 18nbr_GuaranteeObligationsMaximumExposureInYearThree
Total $ 191,108us-gaap_GuaranteeObligationsMaximumExposure