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Acquisitions and Divestitures - Acquisitions (Details) $ in Thousands, € in Millions |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2016 EUR (€) | Aug. 31, 2016 USD ($) | Jul. 01, 2016 EUR (€) | Jul. 01, 2016 USD ($) | Mar. 16, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,679,768 |  | $ 1,679,768 |  | $ 1,632,592
Akron Brass |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid |  |  |  |  | $ 221,400 |  |  |  |  |
Goodwill |  |  |  |  | 124,600 |  |  |  |  |
Intangible assets |  |  |  |  | $ 90,400 |  |  |  |  |
AWG Fittings GmbH (AWG) |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid |  |  | € 42.8 | $ 47,500 |  |  |  |  |  |
Goodwill |  |  |  | 22,000 |  |  |  |  |  |
Intangible assets |  |  |  | $ 10,300 |  |  |  |  |  |
SFC-Koenig AG (SFC) |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid | € 215.9 | $ 241,100 |  |  |  |  |  |  |  |
Goodwill |  | 141,300 |  |  |  |  |  |  |  |
Intangible assets |  | $ 117,000 |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition-related transaction costs |  |  |  |  |  | $ 500 | $ 1,600 | $ 700 | $ 4,000 |
Cost of goods sold |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of inventory charges associated with acquisitions |  |  |  |  |  |  | $ 4,600 |  | $ 10,400 |

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