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Derivative Instruments and Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table summarizes assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016:
 
Balance at
June 30, 2017
 
Level 1
 
Level 2
 
Level 3
 
(unaudited)
 
 
 
 
 
 
Margin accounts
$
756,026

 
$
756,026

 
$
—

 
$
—

Fuel swaps
$
(281,142
)
 
$
—

 
$
(281,142
)
 
$
—

Freight forward agreements
$
1,053,975

 
$
—

 
$
1,053,975

 
$
—

 
 
Balance at
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
Margin accounts
$
488,084

 
$
488,084

 
$
—

 
$
—

Fuel swaps
$
303,675

 
$
—

 
$
303,675

 
$
—

Freight forward agreements
$
(20,950
)
 
$
—

 
$
(20,950
)
 
$
—