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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Annual Purchase Requirements under Contract

The annual purchase requirements under the contract are as follows:

 

2017

   2.7 million  

2018

   8.9 million  

2019

   11.6 million  

2020

   15.5 million  

2021

   15.5 million  

2022

   19.4 million  

2023

   19.4 million