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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Text Block [Abstract]  
Fair Value Hedge Ineffectiveness [Table Text Block]
The impact of our natural gas futures commodity contracts previously designated as fair value hedges and the related hedged item on our consolidated income statement for the year ended December 31, 2016, is presented below:        
 
 
 
Year Ended
 
(in thousands)
 
 
December 31, 2016 (1)
 
Commodity contracts
 
$
(233
)
 
Fair value adjustment for natural gas inventory designated as the hedged item
 
681

 
Total increase in purchased gas cost
 
$
448

 
 
 
 
 
 
The increase in purchased gas cost is comprised of the following:
 
 
 
Basis ineffectiveness
 
$
(83
)
 
Timing ineffectiveness
 
531

 
Total ineffectiveness
 
$
448

 

(1) 
There were no natural gas futures commodity contracts designated as fair value hedges in 2017.
Offsetting Assets and Liabilities [Table Text Block]
The following table summarizes the accounts receivable and payables on a gross and net basis at December 31, 2017 and 2016:
 
 
At December 31, 2017
(in thousands)
 
Gross amounts
 
Amounts offset
 
Net amounts
Accounts receivable
 
$
8,283

 
$
2,391

 
$
5,892

Accounts payable
 
$
16,643

 
$
2,391

 
$
14,252

 
 
At December 31, 2016
(in thousands)
 
Gross amounts
 
Amounts offset
 
Net amounts
Accounts receivable
 
$
2,764

 
$
1,431

 
$
1,333

Accounts payable
 
$
5,335

 
$
1,431

 
$
3,904
Fair Values of Derivative Contracts Recorded in Consolidated Balance Sheets
Fair values of the derivative contracts recorded in the consolidated balance sheets as of December 31, 2017 and 2016, are as follows:
 
Asset Derivatives
 
 
 
Fair Value As Of
(in thousands)
Balance Sheet Location
 
December 31, 2017
 
December 31, 2016
Derivatives not designated as hedging instruments
 
 
 
 
 
Propane swap agreements
Derivative assets, at fair value
 
$
13

 
$
8

Put options
Derivative assets, at fair value
 
—

 
9

Derivatives designated as cash flow hedges
 
 
 
 
 
Natural gas futures contracts
Derivative assets, at fair value
 
92

 
113

Propane swap agreements
Derivative assets, at fair value
 
1,181

 
693

Total asset derivatives
 
 
$
1,286

 
$
823

 

 
Liability Derivatives
 
 
 
Fair Value As Of
(in thousands)
Balance Sheet Location
 
December 31, 2017
 
December 31, 2016
Derivatives not designated as hedging instruments
 
 
 
 
 
Natural gas futures contracts
Derivative liabilities, at fair value
 
$
5,776

 
$
773

Derivatives designated as cash flow hedges
 
 
 
 
 
Natural gas swap contracts
Derivative liabilities, at fair value
 
469

 
—

Propane swap agreements
Derivative liabilities, at fair value
 
2

 
—

Total liability derivatives
 
 
$
6,247

 
$
773
Derivative Instruments and Hedging Activities Disclosure [Text Block]
 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.