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Goodwill and Intangible Assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Major Class of Intangible Asset (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 474,915 | $ 476,191
Intangible assets - Gross Carrying Amount | 565,815 | 567,091
Amortized intangible assets - Accumulated Amortization | (193,075) | (183,764)
Amortized intangible assets - Net | 281,840 | 292,427
Intangible assets - Net | 372,740 | 383,327
Banjo trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 62,100 | 62,100
Akron Brass trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 28,800 | 28,800
Patents |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | 6,528 | 6,468
Amortized intangible assets - Accumulated Amortization | (4,839) | (4,693)
Amortized intangible assets - Net | $ 1,689 | 1,775
Amortized intangible assets - Weighted Average Life | 12 years |
Trade names |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 115,788 | 115,899
Amortized intangible assets - Accumulated Amortization | (59,109) | (57,227)
Amortized intangible assets - Net | $ 56,679 | 58,672
Amortized intangible assets - Weighted Average Life | 16 years |
Customer relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 254,923 | 256,202
Amortized intangible assets - Accumulated Amortization | (90,430) | (85,652)
Amortized intangible assets - Net | $ 164,493 | 170,550
Amortized intangible assets - Weighted Average Life | 14 years |
Unpatented technology |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 96,976 | 96,922
Amortized intangible assets - Accumulated Amortization | (38,172) | (35,685)
Amortized intangible assets - Net | $ 58,804 | 61,237
Amortized intangible assets - Weighted Average Life | 12 years |
Other |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 700 | 700
Amortized intangible assets - Accumulated Amortization | (525) | (507)
Amortized intangible assets - Net | $ 175 | $ 193
Amortized intangible assets - Weighted Average Life | 10 years |

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