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Derivatives and Financial Instruments - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) T | Dec. 31, 2018 USD ($) T | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |
Derivative financial liabilities | $ 100,000 | $ 0 |
Derivative loss deferred in equity | 0 | 400,000 | $ 700,000
Derivative (loss) gain transferred to consolidated income statement | $ 100,000 | $ 100,000 | $ (600,000)
Primary aluminum purchased during period, mass | T | 12,000 | 11,500 |
Overdrafts | $ 0 | $ 3,500,000 |
Long-term debt outstanding | 91,400,000 | 77,100,000 |
Debt issuance costs | 1,100,000 | 1,400,000 |
LME derivative contract |  |  |
Derivative [Line Items] |  |  |
Increase In cost per $100 increase of commodity price | 1,200,000 |  |
Accounts and Other Receivables |  |  |
Derivative [Line Items] |  |  |
Derivative financial assets | 300,000 | 100,000 |
Bank and other loans |  |  |
Derivative [Line Items] |  |  |
Long-term debt outstanding | 92,500,000 | 75,000,000.0 |
Debt issuance costs | 1,100,000 | 1,400,000 |
Variable interest rate debt | $ 17,500,000 | $ 0 |

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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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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