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Derivative Instruments
 12 Months Ended
Dec. 31, 2017
Text Block [Abstract]  
Derivative Instruments
 The effects of gains and losses from derivative instruments are as follows:
 
Amount of Gain (Loss) on Derivatives:
  
Location of Gain
(Loss) on Derivatives
 
For the Year Ended December 31,
(in thousands)
2017
 
2016
 
2015
Derivatives not designated as hedging instruments
 
 
 
 
 
 
 
Realized gain (loss) on forward contracts and options (1)
Revenue
 
$
112

 
$
(546
)
 
$
426

Unrealized (loss) on forward contracts (1)
Revenue
 
—

 
—

 
(126
)
Natural gas futures contracts
Cost of sales
 
(3,633
)
 
(541
)
 
—

Propane swap agreements
Cost of sales
 
8

 
7

 
18

Natural gas swap contracts
Cost of sales
 
1

 
—

 
—

Derivatives designated as fair value hedges
 
 
 
 
 
 
 
Put/Call option
Cost of sales
 
(9
)
 
49

 
528

Put/Call option (2)
Propane inventory
 
—

 
—

 
43

Natural gas futures contracts
Natural gas inventory
 
—

 
(233
)
 
—

Derivatives designated as cash flow hedges
 
 
 
 
 
 
 
Propane swap agreements
Cost of sales
 
1,607

 
(364
)
 
(120
)
Propane swap agreements
Other comprehensive income (loss)
 
487

 
1,016

 
(323
)
Call options
Cost of sales
 
—

 
—

 
(81
)
Natural gas futures contracts
Cost of sales
 
(456
)
 
345

 
—

Natural gas swap contracts
Cost of sales
 
(822
)
 
—

 
—

Natural gas futures contracts
Other comprehensive income (loss)
 
(1,476
)
 
222

 
109

Natural gas swap contracts
Other comprehensive income (loss)
 
986

 
—

 
—

Total
 
 
$
(3,195
)
 
$
(45
)
 
$
474

(1)
All of the realized and unrealized gain (loss) on forward contracts represents the effect of trading activities on our consolidated statements of income.
(2)
As a fair value hedge with no ineffective portion, the unrealized gains and losses associated with this call option are recorded in cost of sales, offset by the corresponding change in the value of propane inventory (hedged item), which is also recorded in cost of sales. The amounts in cost of sales offset to zero, and the unrealized gains and losses of this call option effectively changed the value of propane inventory on the consolidated balance sheets.