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Goodwill and Long-Lived Assets - Summary of Aggregate Amortization Related to Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Acquired customer contracts |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total amortization expense | [1] | $ 9,775 | $ 11,605 | $ 9,240
Acquired software |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total amortization expense | [2] | 2,410 | 2,750 | 2,405
Internal use software |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total amortization expense | [3] | 13,624 | 14,140 | 13,316
Software |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total amortization expense |  | $ 16,034 | $ 16,890 | $ 15,721
[1] | Acquired customer contracts represent assets acquired in our prior business acquisitions. Acquired customer contracts are amortized over their estimated useful lives ranging from three to twenty years based on the approximate pattern in which the economic benefits of the intangible assets are expected to be realized, with the amortization expense included as cost of revenue in our Income Statements.
[2] | Acquired software represents software intangible assets acquired in our prior business acquisitions, which are amortized over their estimated useful lives ranging from four to eight years. The amortization of acquired software is reflected as a cost of revenue in our Income Statements.
[3] | Internal use software represents: (i) third-party software licenses; and (ii) the internal and external costs related to the implementation of the third-party software licenses. Internal use software is amortized over its estimated useful life ranging from one to ten years.

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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