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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 144,330 |  | $ 144,330 |  | $ 144,656
Accumulated Amortization | (72,094) |  | (72,094) |  | (65,535)
Net Amount | 72,236 |  | 72,236 |  | 79,121
Amortization expense | 2,348 | $ 2,253 | 7,065 | $ 6,816 |
Customer Lists/Relationships |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 96,889 |  | 96,889 |  | 97,355
Accumulated Amortization | (47,790) |  | (47,790) |  | (44,002)
Net Amount | 49,099 |  | 49,099 |  | 53,353
Technology and Other Intangibles |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 47,441 |  | 47,441 |  | 47,301
Accumulated Amortization | (24,304) |  | (24,304) |  | (21,533)
Net Amount | $ 23,137 |  | $ 23,137 |  | $ 25,768

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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