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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Text Block [Abstract] |
Schedule of Derivative Instruments [Table Text Block] | As of December 31, 2018, the volume of our open commodity derivative contracts were as follows:
Business unit |  | Commodity |  | Quantity hedged (in millions) |  | Designation |  | Longest Expiration date of hedge
PESCO/natural gas marketing |  | Natural gas (Dts) |  | 14.4 |  | Cash flows hedges |  | March 2022
PESCO/natural gas marketing |  | Natural gas (Dts) |  | 3.8 |  | Not designated |  | December 2020
Sharp/propane operations |  | Propane (gallons) |  | 9.7 |  | Cash flows hedges |  | June 2021
Sharp/propane operations |  | Propane (gallons) |  | 0.3 |  | Fair value hedges |  | March 2019
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, 2018 and 2017:
|  | At December 31, 2018
(in thousands) |  | Gross amounts |  | Amounts offset |  | Net amounts
Accounts receivable |  | $ | 12,368 |  |  | $ | 3,834 |  |  | $ | 8,534 |
Accounts payable |  | $ | 24,741 |  |  | $ | 3,834 |  |  | $ | 20,907 |
|  | 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 related to PESCO are as follows:
(in thousands) | Balance Sheet Location |  | December 31, 2018 |  | December 31, 2017
PESCO | Other Current Assets |  | $ | 2,810 |  |  | $ | 6,300 |
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, 2018 and 2017 are as follows:
| Derivative Assets
|  |  | Fair Value As Of
(in thousands) | Balance Sheet Location |  | December 31, 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 |  | 4,024 |  |  | — |
Derivatives designated as fair value hedges |  |  |  |  |
Propane put options | Derivative assets, at fair value |  | 71 |  |  | — |
Derivatives designated as cash flow hedges |  |  |  |  |
Natural gas futures contracts | Derivative assets, at fair value |  | 9,059 |  |  | 92 |
Propane swap agreements | Derivative assets, at fair value |  | 11 |  |  | 1,181 |
Total Derivative Assets |  |  | $ | 13,165 |  |  | $ | 1,286 |
| Derivative Liabilities
|  |  | Fair Value As Of
(in thousands) | Balance Sheet Location |  | December 31, 2018 |  | December 31, 2017
Derivatives not designated as hedging instruments |  |  |  |  |
Natural gas futures contracts | Derivative liabilities, at fair value |  | $ | 4,562 |  |  | $ | 5,776 |
Derivatives designated as cash flow hedges |  |  |  |  |
Natural gas futures contracts | Derivative liabilities, at fair value |  | 8,705 |  |  | — |
Natural gas swap contracts | Derivative liabilities, at fair value |  | — |  |  | 469 |
Propane swap agreements | Derivative liabilities, at fair value |  | 1,604 |  |  | 2 |
Total Derivative Liabilities |  |  | $ | 14,871 |  |  | $ | 6,247 |
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) | 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.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | As of December 31, 2018, the following amounts were recorded in the 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 December 31, 2018 |  | At December 31, 2017 |  | At December 31, 2018 |  | At December 31, 2017
Inventory |  | $ | 212 |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959 + Details
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