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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Offsetting Assets and Liabilities [Table Text Block]
The following table summarizes the accounts receivable and payable on a gross and net basis at September 30, 2018 and December 31, 2017:
 
 
At September 30, 2018
(in thousands)
 
Gross amounts
 
Amounts offset
 
Net amounts
Accounts receivable
 
$
7,042

 
$
1,158

 
$
5,884

Accounts payable
 
$
11,264

 
$
1,158

 
$
10,106

 
 
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
Schedule of Due to (from) Broker-Dealers and Clearing Organizations [Table Text Block]
The balances are as follows:

(in thousands)
Balance Sheet Location
 
At September 30, 2018
 
At December 31, 2017
Sharp
Other Current Liabilities
 
$
18

 
$
—

PESCO
Other Current Assets
 
$
2,060

 
$
6,300
Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet
The fair values of the derivative contracts recorded in the condensed consolidated balance sheets as of September 30, 2018 and December 31, 2017, are as follows: 
 
 
Asset Derivatives
 
 
 
 
Fair Value As Of
(in thousands)
 
Balance Sheet Location
 
September 30, 2018
 
December 31, 2017
Derivatives not designated as hedging instruments
 
 
 
 
 
 
Propane swap agreements
 
Derivative assets, at fair value
 
$
—

 
$
13

Natural gas futures contracts
 
Derivative assets, at fair value
 
1,841

 
—

Derivatives designated as fair value hedges
 
 
 
 
 
 
Propane put options
 
Derivative assets, at fair value
 
19

 
—

Derivatives designated as cash flow hedges
 
 
 
 
 
 
Natural gas futures contracts
 
Derivative assets, at fair value
 
8,114

 
92

Propane swap agreements
 
Derivative assets, at fair value
 
594

 
1,181

Total asset derivatives
 
 
 
$
10,568

 
$
1,286



 
 
 
Liability Derivatives
 
 
 
 
Fair Value As Of
(in thousands)
 
Balance Sheet Location
 
September 30, 2018
 
December 31, 2017
Derivatives not designated as hedging instruments
 
 
 
 
 
 
Natural gas futures contracts
 
Derivative liabilities, at fair value
 
$
1,602

 
$
5,776

Derivatives designated as cash flow hedges
 
 
 
 
 
 
Natural gas futures contracts
 
Derivative liabilities, at fair value
 
8,168

 
469

Natural gas swap contracts
 
Derivative liabilities, at fair value
 
—

 
2

Propane swap agreements
 
Derivative liabilities, at fair value
 
4

 
—

Total liability derivatives
 
 
 
$
9,774

 
$
6,247
Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements
The effects of gains and losses from derivative instruments on the condensed consolidated financial statements are as follows: 
  
 
 
 
Amount of Gain (Loss) on Derivatives:
 
 
Location of Gain
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
(in thousands)
 
(Loss) on Derivatives
 
2018
 
2017
 
2018
 
2017
Derivatives not designated as hedging instruments
 
 
 
 
 
 
 
 
 
 
Realized gain on forward contracts and options (1)
 
Revenue
 
$
—

 
$
—

 
$
—

 
$
112

Natural gas futures contracts
 
Cost of sales
 
197

 
286

 
(2,766
)
 
907

Propane swap agreements
 
Cost of sales
 
—

 
15

 
(13
)
 
11

Natural gas swap contracts
 
Cost of sales
 
—

 
1

 
—

 
1

Derivatives designated as fair value hedges
 
 
 
 
 
 
 
 
 
 
Put /Call option (2)
 
Cost of sales
 
—

 
—

 
—

 
(9
)
Derivatives designated as cash flow hedges
 
 
 
 
 
 
 
 
 
 
Propane swap agreements
 
Cost of sales
 
(276
)
 
198

 
(921
)
 
663

Propane swap agreements
 
Other comprehensive income (loss)
 
296

 
1,590

 
(590
)
 
814

       Natural gas futures contracts
 
Cost of sales
 
(308
)
 
(852
)
 
(171
)
 
929

       Natural gas swap contracts
 
Cost of sales
 
123

 
1

 
(358
)
 
1

       Natural gas swap contracts
 
Other comprehensive income (loss)
 
(25
)
 
(413
)
 
563

 
(413
)
       Natural gas futures contracts
 
Other comprehensive income (loss)
 
630

 
(1,296
)
 
(241
)
 
(1,420
)
Total
 
 
 
$
637

 
$
(470
)
 
$
(4,497
)
 
$
1,596



(1) 
All of the realized and unrealized gain (loss) on forward contracts represents the effect of trading activities on our condensed 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 put option effectively changed the value of propane inventory on the condensed consolidated balance sheets.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
As of September 30, 2018, the following amounts were recorded in the condensed consolidated balance sheets related to fair value hedges:
(in thousands)
 
Carrying Amount of Hedged Item
Cumulative Adjustment Included in Carrying Amount of Hedged Item
Balance Sheet Location of Hedged Items
 
At September 30, 2018
At December 31, 2017
At September 30, 2018
At December 31, 2017
Inventory
 
$
290

$
—

$
—

$
—