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Contractual Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Estimated future payments related to operating lease commitments

As of December 31, 2017, the estimated future payments related to these contracts are as follows:

 

     Up to 1 year      From 1 to 5 years      After 6 years  

Estimated future payments

     5,480        4,265        504