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Derivative Instruments
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Derivatives not designated as hedging instruments
 
 
 
 
 
 
 
Realized gain (loss) on forward contracts and options (1)
Revenue
 
$
—

 
$
112

 
$
(546
)
Natural gas futures contracts
Cost of sales
 
(3,189
)
 
(3,633
)
 
(541
)
Propane swap agreements
Cost of sales
 
(13
)
 
8

 
7

Natural gas swap contracts
Cost of sales
 
—

 
1

 
—

Derivatives designated as fair value hedges
 
 
 
 
 
 
 
Put/Call option
Cost of sales
 
—

 
(9
)
 
49

Natural gas futures contracts
Natural gas inventory
 
—

 
—

 
(233
)
Derivatives designated as cash flow hedges
 
 
 
 
 
 
 
Propane swap agreements
Cost of sales
 
(647
)
 
1,607

 
(364
)
Propane swap agreements
Other comprehensive income (loss)
 
(2,773
)
 
487

 
1,016

Natural gas futures contracts
Cost of sales
 
(2,010
)
 
(456
)
 
345

Natural gas swap contracts
Cost of sales
 
197

 
(822
)
 
—

Natural gas futures contracts
Other comprehensive income (loss)
 
532

 
(1,476
)
 
222

Natural gas swap contracts
Other comprehensive income
 
200

 
986

 
—

Total
 
 
$
(7,703
)
 
$
(3,195
)
 
$
(45
)
(1) All of the realized and unrealized gain (loss) on forward contracts represents the effect of trading activities on our consolidated statements of income.