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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2017
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 rail cars, office space, and other equipment. Future minimum annual commitments under such operating leases at September 30, 2017 are as follows:

 

2018

 

$

11,669

 

2019

 

 

10,002

 

2020

 

 

7,181

 

2021

 

 

5,220

 

2022

 

 

829

 

Thereafter

 

 

699