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Derivatives and Financial Instruments - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) T | Dec. 31, 2017 USD ($) T | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |
Derivative financial liabilities | $ 0 |  |
Derivative loss deferred in equity | 400,000 | $ 700,000 | $ 3,100,000
Derivative (loss) gain transferred to consolidated income statement | $ (100,000) | $ 600,000 | $ (900,000)
Primary aluminum purchased during period, mass | T | 11,500 | 12,500 |
Overdrafts | $ 3,500,000 | $ 4,200,000 |
Long-term debt outstanding | 77,100,000 | 113,800,000 |
Debt issuance costs | $ 1,400,000 | $ 1,700,000 |
LME derivative contract |  |  |
Derivative [Line Items] |  |  |
Percentage of primary aluminum requirement hedged by LME derivatives | 0.00% | 32.00% |
Derivative, nonmonetary notional amount, mass | T | 3,300 | 3,000 |
Increase in cost per $100 increase in LME price of aluminum | $ 1,100,000 |  |
Accounts and Other Receivables |  |  |
Derivative [Line Items] |  |  |
Derivative financial assets | 100,000 | $ 2,100,000 |
Other Non-current Assets |  |  |
Derivative [Line Items] |  |  |
Derivative financial assets | 0 | 300,000 |
Other Current Liabilities |  |  |
Derivative [Line Items] |  |  |
Derivative financial liabilities |  | 1,500,000 |
Other Noncurrent Liabilities |  |  |
Derivative [Line Items] |  |  |
Derivative financial liabilities |  | 400,000 |
Bank and other loans |  |  |
Derivative [Line Items] |  |  |
Long-term debt outstanding | 75,000,000 | 111,300,000 |
Debt issuance costs | 1,400,000 | 1,700,000 |
Variable interest rate debt | $ 0 | $ 21,300,000 |

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- Definition Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1243-112600 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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