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Intangible Assets, net - By type (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 184,899 | $ 185,017
Accumulated Amortization | (123,368) | (107,546)
Customer-related |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 147,169 | 147,244
Accumulated Amortization | $ (86,512) | $ (76,176)
Customer-related | Minimum |  |
Finite-Lived Intangible Assets |  |
Useful life | 10 years | 10 years
Customer-related | Maximum |  |
Finite-Lived Intangible Assets |  |
Useful life | 25 years | 25 years
Contract-based |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 37,730 | $ 37,773
Accumulated Amortization | $ (36,856) | $ (31,370)
Contract-based | Minimum |  |
Finite-Lived Intangible Assets |  |
Useful life | 5 years | 5 years
Contract-based | Maximum |  |
Finite-Lived Intangible Assets |  |
Useful life | 7 years | 7 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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