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Intangible Assets - Schedule of Gross Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 538,420 | $ 537,218
Accumulated Amortization | (315,969) | (291,260)
Net Carrying Amount | 222,451 | 245,958
Backlog |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 147,456 | 145,855
Accumulated Amortization | (106,573) | (101,038)
Net Carrying Amount | $ 40,883 | 44,817
Amortization Period (in years) | 3 years |
Customer Relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 262,830 | 264,129
Accumulated Amortization | (122,265) | (110,450)
Net Carrying Amount | $ 140,565 | 153,679
Amortization Period (in years) | 8 years |
Leases |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 670 | 670
Accumulated Amortization | (604) | (599)
Net Carrying Amount | $ 66 | 71
Amortization Period (in years) | 5 years |
Developed Technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 112,939 | 112,039
Accumulated Amortization | (75,887) | (68,968)
Net Carrying Amount | $ 37,052 | 43,071
Amortization Period (in years) | 4 years |
Trade Name |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,200 | 8,200
Accumulated Amortization | (8,067) | (7,967)
Net Carrying Amount | $ 133 | 233
Amortization Period (in years) | 1 year |
Non compete Agreements |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,250 | 4,250
Accumulated Amortization | (2,372) | (2,043)
Net Carrying Amount | $ 1,878 | 2,207
Amortization Period (in years) | 3 years |
In Process Research and Development |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,800 | 1,800
Accumulated Amortization |  | 0
Net Carrying Amount | 1,800 | 1,800
Other Intangibles |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 275 | 275
Accumulated Amortization | (201) | (195)
Net Carrying Amount | $ 74 | $ 80
Amortization Period (in years) | 10 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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