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Derivative Instruments | 12 Months Ended
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Dec. 31, 2018
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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.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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- References No definition available. + Details
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