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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Annual Commitments Under Operating Leases

The Company is obligated under certain operating leases and rental agreements for railroad cars, office space, and other equipment. Future minimum annual commitments under such operating leases at December 31, 2016 are as follows:

 

Twelve months ending December 31,

 

 

 

 

2017

 

$

6,576

 

2018

 

 

5,173

 

2019

 

 

4,052

 

2020

 

 

3,038

 

2021

 

 

2,247

 

Thereafter

 

 

338