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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | $ 2,203,897 |  | $ 2,203,897 |  | $ 2,075,215
Accumulated amortization | 1,234,805 |  | 1,234,805 |  | 1,116,854
Finite-Lived Intangible Assets, Net | 969,092 |  | 969,092 |  | 958,361
Intangible Assets, Gross (Excluding Goodwill) | 2,300,620 |  | 2,300,620 |  | 2,171,868
Intangible assets, net | 1,065,815 |  | 1,065,815 |  | 1,055,014
Amortization expense | 35,393 | $ 34,642 | 103,828 | $ 104,930 |
Acquisition-related amortization expense | 34,797 | $ 34,157 | 102,443 | $ 103,531 |
Trademarks [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Accumulated amortization | 0 |  | 0 |  | 0
Customer Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 1,509,305 |  | 1,509,305 |  | 1,410,636
Accumulated amortization | 796,653 |  | 796,653 |  | 714,566
Finite-Lived Intangible Assets, Net | 712,652 |  | 712,652 |  | 696,070
Trademarks [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 226,762 |  | 226,762 |  | 218,064
Accumulated amortization | 98,541 |  | 98,541 |  | 85,791
Finite-Lived Intangible Assets, Net | 128,221 |  | 128,221 |  | 132,273
Patents [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 161,314 |  | 161,314 |  | 159,376
Accumulated amortization | 138,584 |  | 138,584 |  | 133,677
Finite-Lived Intangible Assets, Net | 22,730 |  | 22,730 |  | 25,699
Unpatented Technologies [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 170,859 |  | 170,859 |  | 154,505
Accumulated amortization | 108,633 |  | 108,633 |  | 99,276
Finite-Lived Intangible Assets, Net | 62,226 |  | 62,226 |  | 55,229
Distributor Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 84,045 |  | 84,045 |  | 82,779
Accumulated amortization | 49,200 |  | 49,200 |  | 44,202
Finite-Lived Intangible Assets, Net | 34,845 |  | 34,845 |  | 38,577
Drawings and Manuals [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 28,054 |  | 28,054 |  | 27,500
Accumulated amortization | 24,585 |  | 24,585 |  | 22,403
Finite-Lived Intangible Assets, Net | 3,469 |  | 3,469 |  | 5,097
Other Intangible Assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 23,558 |  | 23,558 |  | 22,355
Accumulated amortization | 18,609 |  | 18,609 |  | 16,939
Finite-Lived Intangible Assets, Net | $ 4,949 |  | $ 4,949 |  | $ 5,416

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