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Derivative Financial Instruments | 9 Months Ended
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Sep. 30, 2017
Summary of Derivative Instruments [Abstract] |
Derivative Financial Instruments | Tredegar uses derivative financial instruments for the purpose of hedging margin exposure from fixed-price forward sales contracts in Aluminum Extrusions and currency exchange rate exposures that exist as part of ongoing PE Films and Flexible Packaging Films business operations. These derivative financial instruments are designated as and qualify as cash flow hedges and are recognized in the consolidated balance sheet at fair value. The fair value of derivative instruments recorded on the consolidated balance sheets are based upon Level 2 inputs. If individual derivative instruments with the same counterparty can be settled on a net basis, the Company records the corresponding derivative fair values as a net asset or net liability. In the normal course of business, Aluminum Extrusions enters into fixed-price forward sales contracts with certain customers for the future sale of fixed quantities of aluminum extrusions at scheduled intervals. In order to hedge margin exposure created from the fixing of future sales prices relative to volatile raw material (aluminum) costs, Aluminum Extrusions enters into a combination of forward purchase commitments and futures contracts to acquire or hedge aluminum, based on the scheduled purchases for the firm sales commitments. The fixed-price firm sales commitments and related hedging instruments generally have durations of not more than 12 months, and the notional amount of aluminum futures contracts that hedged future purchases of aluminum to meet fixed-price forward sales contract obligations was $7.1 million (7.4 million pounds of aluminum) at September 30, 2017 and $8.0 million (9.6 million pounds of aluminum) at December 31, 2016. The table below summarizes the location and gross amounts of aluminum futures contract fair values in the consolidated balance sheets as of September 30, 2017 and December 31, 2016:
| September 30, 2017 |  | December 31, 2016
(In Thousands) | Balance Sheet Account |  | Fair Value |  | Balance Sheet Account |  | Fair Value
Derivatives Designated as Hedging Instruments |  |  |  |  |  |  |
Asset derivatives: Aluminum futures contracts | Prepaid expenses and other |  | $ | 792 |  |  | Prepaid expenses and other |  | $ | 308 |
Liability derivatives: Aluminum futures contracts | Prepaid expenses and other |  | $ | (25 | ) |  | Prepaid expenses and other |  | $ | (37 | )
Net asset (liability) |  |  | $ | 767 |  |  |  |  | $ | 271 |
In the event that a counterparty to an aluminum fixed-price forward sales contract chooses not to take delivery of its aluminum extrusions, the customer is contractually obligated to compensate Aluminum Extrusions for any losses on the related aluminum futures and/or forward contracts through the date of cancellation. The Company's earnings are exposed to foreign currency exchange risk primarily through the translation of the financial statements of subsidiaries that have a functional currency other than the U.S. Dollar. On September 29, 2017, the Flexible Packaging Films business unit in Brazil (“Terphane Ltda.”) entered into 15 monthly foreign exchange average forward rate contracts to purchase Brazilian Real (“R$”) and sell U.S. Dollars covering the period from October 2017 through December 2018. These foreign currency exchange contracts have been designated and qualify as cash flow hedges of Terphane Ltda.'s forecasted sales to customers quoted or priced in U.S. Dollars over that period. By changing the currency risk associated with these U.S. Dollar sales, the derivatives have the effect of offsetting operating costs quoted or priced in Brazilian Real and decreasing the net exposure to Brazilian Real in the consolidated statements of income. The aggregate notional amount of open foreign exchange contracts at September 30, 2017 was $18.75 million (R$60.7 million). The forward rates contracted and the related market rates as of September 30, 2017 were the same, and accordingly the fair value of all 15 open forward contracts were zero at that date. These derivative contracts involve elements of market risk that are not reflected on the consolidated balance sheet, including the risk of dealing with counterparties and their ability to meet the terms of the contracts. The counterparties to any forward purchase commitments are major aluminum brokers and suppliers, and the counterparties to any aluminum futures contracts are major financial institutions. Fixed-price forward sales contracts are only made available to the best and most credit-worthy customers. The counterparties to the Company’s foreign currency cash flow hedge contracts are major financial institutions. The effect on net income (loss) and other comprehensive income (loss) of derivative instruments classified as cash flow hedges and described in the previous paragraphs for the three and nine month periods ended September 30, 2017 and 2016 is summarized in the table below:
(In Thousands) | Cash Flow Derivative Hedges
| Aluminum Futures Contracts |  | Foreign Currency Forwards
| Three Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Amount of pretax gain (loss) recognized in other comprehensive income (loss) | $ | 757 |  |  | $ | (230 | ) |  | $ | — |  |  | $ | — |
Location of gain (loss) reclassified from accumulated other comprehensive income (loss) into net income (loss) (effective portion) | Cost of sales |  |  | Cost of sales |  |  | Cost of sales |  |  | Cost of sales |
Amount of pretax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss) (effective portion) | $ | 231 |  |  | $ | (160 | ) |  | $ | 15 |  |  | $ | 15 |
| Aluminum Futures Contracts |  | Foreign Currency Forwards
| Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Amount of pre-tax gain (loss) recognized in other comprehensive income (loss) | $ | 1,281 |  |  | $ | (93 | ) |  | $ | — |  |  | $ | — |
Location of gain (loss) reclassified from accumulated other comprehensive income (loss) into net income (loss) (effective portion) | Cost of sales |  |  | Cost of sales |  |  | Cost of sales |  |  | Cost of sales |
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss) (effective portion) | $ | 785 |  |  | $ | (1,669 | ) |  | $ | 46 |  |  | $ | 46 |
As of September 30, 2017, the Company expects $0.5 million of unrealized after-tax gains on derivative instruments reported in accumulated other comprehensive income (loss) to be reclassified to earnings within the next 12 months. For the three and nine month periods ended September 30, 2017 and 2016, net gains or losses realized, from previously unrealized net gains or losses on hedges that had been discontinued, were not material.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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