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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount, amortizing intangible assets | $ 125,440 | $ 112,854
Accumulated amortization, amortizing intangible assets | 86,888 | 79,522
Net carrying amount, amortizing intangible assets | 38,552 | 33,332
Gross carrying amount, non-amortizing intangible assets | 130,540 | 117,954
Accumulated amortization, non-amortizing intangible assets | 43,652 | 38,432
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount, non-amortizing intangible assets | 5,100 | 5,100
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount, amortizing intangible assets | 110,502 | 99,613
Accumulated amortization, amortizing intangible assets | 82,343 | 76,808
Net carrying amount, amortizing intangible assets | 28,159 | 22,805
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount, amortizing intangible assets | 11,401 | 9,855
Accumulated amortization, amortizing intangible assets | 2,108 | 653
Net carrying amount, amortizing intangible assets | 9,293 | 9,202
Acquired software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount, amortizing intangible assets | 3,537 | 3,386
Accumulated amortization, amortizing intangible assets | 2,437 | 2,061
Net carrying amount, amortizing intangible assets | $ 1,100 | $ 1,325

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