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Derivative Instruments (Tables)
 9 Months Ended
Oct. 31, 2015
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Our outstanding derivative instrument contracts for the third quarter of 2015 were comprised of the following:
 
Third Quarter
(In thousands)
2015
Diesel fuel collars (in gallons)
6,775
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The fair value of our outstanding derivative instrument contracts was as follows:
 
 
Assets (Liabilities)
(In thousands)
 
Third Quarter
Derivative Instrument
Balance Sheet Location
2015
Diesel fuel collars
Other current assets
$
134

 
Other assets
308

 
Accrued operating expenses
(1,476
)
 
Other liabilities
(1,190
)
Total derivative instruments
 
$
(2,224
)
Derivative Instruments, Gain (Loss) [Table Text Block]
The effect of derivative instruments on the consolidated statements of operations was as follows:
 
 
Amount of Gain (Loss)
(In thousands)
 
Third Quarter
 
Year-to-Date
Derivative Instrument
Statements of Operations Location
2015
 
2015
Diesel fuel collars
 
 
 
 
Realized
Other income (expense)
$
(163
)
 
$
(163
)
Unrealized
Other income (expense)
(510
)
 
(2,224
)
Total derivative instruments
 
$
(673
)
 
$
(2,387
)