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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 2,139,910 |  | $ 2,075,215
Accumulated amortization | 1,140,331 |  | 1,116,854
Finite-Lived Intangible Assets, Net | 999,579 |  | 958,361
Intangible Assets, Gross (Excluding Goodwill) | 2,236,471 |  | 2,171,868
Intangible assets, net | 1,096,140 |  | 1,055,014
Amortization expense | 34,197 | $ 35,550 |
Acquisition-related amortization expense | 33,817 | $ 35,155 |
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | 0 |  | 0
Customer Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,467,966 |  | 1,410,636
Accumulated amortization | 731,391 |  | 714,566
Finite-Lived Intangible Assets, Net | 736,575 |  | 696,070
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 220,805 |  | 218,064
Accumulated amortization | 89,123 |  | 85,791
Finite-Lived Intangible Assets, Net | 131,682 |  | 132,273
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 158,612 |  | 159,376
Accumulated amortization | 134,360 |  | 133,677
Finite-Lived Intangible Assets, Net | 24,252 |  | 25,699
Unpatented Technologies [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 162,763 |  | 154,505
Accumulated amortization | 100,858 |  | 99,276
Finite-Lived Intangible Assets, Net | 61,905 |  | 55,229
Distributor Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 80,237 |  | 82,779
Accumulated amortization | 44,889 |  | 44,202
Finite-Lived Intangible Assets, Net | 35,348 |  | 38,577
Drawings and Manuals [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 26,619 |  | 27,500
Accumulated amortization | 22,228 |  | 22,403
Finite-Lived Intangible Assets, Net | 4,391 |  | 5,097
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 22,908 |  | 22,355
Accumulated amortization | 17,482 |  | 16,939
Finite-Lived Intangible Assets, Net | $ 5,426 |  | $ 5,416

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