Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Other Liabilities Disclosure [Abstract]  
Schedule of Other Liabilities
 
As of December 31,
 
2015
 
2014
Port Authority terminal obligations
$
7,850

 
$
8,409

Postretirement benefit obligations
4,030

 
4,360

Other
3,115

 
5,115

Other liabilities
$
14,995

 
$
17,884