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Acquisitions and Divestitures - Acquired Intangible Assets and Weighted Average Amortization Periods (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
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Mar. 16, 2016 | Apr. 28, 2014 | Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  |  | $ 64,359
Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  |  | $ 9,247
Weighted Average Life |  |  | 15 years
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  |  | $ 44,401
Weighted Average Life |  |  | 12 years
Unpatented technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  |  | $ 10,711
Weighted Average Life |  |  | 8 years
Akron Brass |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets | $ 188,877 |  |
Indefinite lived | 28,800 |  |
Total acquired intangible assets | 217,677 |  |
Akron Brass | Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets | $ 14,078 |  |
Weighted Average Life | 15 years |  |
Akron Brass | Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets | $ 134,519 |  |
Weighted Average Life | 13 years |  |
Akron Brass | Unpatented technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets | $ 40,280 |  |
Weighted Average Life | 13 years |  |
Aegis |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  | $ 8,770 |
Aegis | Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  | $ 3,304 |
Weighted Average Life |  | 15 years |
Aegis | Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  | $ 4,393 |
Weighted Average Life |  | 14 years |
Aegis | Unpatented technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized intangible assets |  | $ 1,073 |
Weighted Average Life |  | 8 years |

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- Definition Intangible Assets Acquired + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
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