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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2017 are as follows:

 

2018

 

$

8,087

 

2019

 

 

6,927

 

2020

 

 

5,440

 

2021

 

 

3,129

 

2022

 

 

1,436

 

Thereafter

 

 

285