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Goodwill and Intangible Assets - 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] |  |  |  |  |
Cost | $ 271,622 |  | $ 271,622 |  | $ 244,364
Accumulated Amortization | (150,767) |  | (150,767) |  | (136,955)
Accumulated Impairment Loss | (3,814) |  | (3,814) |  | (3,814)
Net Intangible Assets | 117,041 |  | 117,041 |  | 103,595
Amortization of intangible assets | 4,900 | $ 4,200 | 13,800 | $ 13,300 |
Contract and customer-related |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Cost | 240,452 |  | 240,452 |  | 213,194
Accumulated Amortization | (123,019) |  | (123,019) |  | (110,917)
Accumulated Impairment Loss | (3,814) |  | (3,814) |  | (3,814)
Net Intangible Assets | 113,619 |  | 113,619 |  | 98,463
Acquired technologies |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Cost | 12,400 |  | 12,400 |  | 12,400
Accumulated Amortization | (11,633) |  | (11,633) |  | (10,787)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | 767 |  | 767 |  | 1,613
Trade names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Cost | 18,770 |  | 18,770 |  | 18,770
Accumulated Amortization | (16,115) |  | (16,115) |  | (15,251)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | $ 2,655 |  | $ 2,655 |  | $ 3,519

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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