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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 2,256,138 |  | $ 2,277,349
Accumulated amortization | 1,312,871 |  | 1,290,419
Finite-Lived Intangible Assets, Net | 943,267 |  | 986,930
Intangible Assets, Gross (Excluding Goodwill) | 2,352,928 |  | 2,374,191
Intangible assets, net | 1,040,057 |  | 1,083,772
Amortization expense | 35,612 | $ 34,197 |
Acquisition-related amortization expense | 35,173 | $ 33,817 |
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | 0 |  | 0
Customer Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,545,214 |  | 1,559,771
Accumulated amortization | 851,227 |  | 834,798
Finite-Lived Intangible Assets, Net | 693,987 |  | 724,973
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 231,560 |  | 233,205
Accumulated amortization | 107,093 |  | 103,907
Finite-Lived Intangible Assets, Net | 124,467 |  | 129,298
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 162,185 |  | 163,299
Accumulated amortization | 141,440 |  | 141,182
Finite-Lived Intangible Assets, Net | 20,745 |  | 22,117
Unpatented Technologies [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 179,039 |  | 180,947
Accumulated amortization | 115,129 |  | 113,404
Finite-Lived Intangible Assets, Net | 63,910 |  | 67,543
Distributor Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 86,108 |  | 87,028
Accumulated amortization | 52,474 |  | 51,611
Finite-Lived Intangible Assets, Net | 33,634 |  | 35,417
Drawings and Manuals [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 28,135 |  | 29,198
Accumulated amortization | 25,851 |  | 26,193
Finite-Lived Intangible Assets, Net | 2,284 |  | 3,005
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 23,897 |  | 23,901
Accumulated amortization | 19,657 |  | 19,324
Finite-Lived Intangible Assets, Net | $ 4,240 |  | $ 4,577

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