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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, 2019 | Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 387,067 | $ 294,767
Accumulated Amortization | (136,119) | (115,249)
Net Carrying Amount | 250,948 | 179,518
Backlog |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 108,454 | 80,754
Accumulated Amortization | (65,636) | (58,295)
Net Carrying Amount | $ 42,818 | 22,459
Amortization Period (in years) | 3 years |
Customer Relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 178,729 | 121,629
Accumulated Amortization | (45,839) | (38,974)
Net Carrying Amount | $ 132,890 | 82,655
Amortization Period (in years) | 7 years |
Leases |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 670 | 670
Accumulated Amortization | (566) | (561)
Net Carrying Amount | $ 104 | 109
Amortization Period (in years) | 5 years |
Developed Technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 89,139 | 87,839
Accumulated Amortization | (20,736) | (15,174)
Net Carrying Amount | $ 68,403 | 72,665
Amortization Period (in years) | 4 years |
Trade Name |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,400 | 3,600
Accumulated Amortization | (2,992) | (2,100)
Net Carrying Amount | $ 4,408 | 1,500
Amortization Period (in years) | 1 year |
Non compete Agreements |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,400 | 0
Accumulated Amortization | (200) | 0
Net Carrying Amount | $ 2,200 | 0
Amortization Period (in years) | 2 years |
Other Intangibles |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 275 | 275
Accumulated Amortization | (150) | (145)
Net Carrying Amount | $ 125 | $ 130
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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