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Derivative Financial Instruments (Narrative) (Details) $ in Thousands, lb in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) lb | Dec. 31, 2013 lb | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |  |
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months | $ (1,800) |  |
Aluminum Futures Contracts |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 23,300 |  | $ 8,600
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs | lb | 23.8 | 7.8 |
Net asset (liability), Fair Value | $ (2,836) |  | (236)
Accrued Expenses [Member] | Derivatives Not Designated As Hedging Instruments | Aluminum Futures Contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 29 |  | 7
Derivative Liability, Fair Value, Gross Liability | 29 |  | 7
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  | 82
Derivative Liability, Fair Value, Gross Liability | $ 2,836 |  | $ 318

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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