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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 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 June 30, 2017 are as follows:

 

2018

 

$

10,282

 

2019

 

 

9,455

 

2020

 

 

5,996

 

2021

 

 

3,691

 

2022

 

 

1,142

 

Thereafter

 

 

263