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Goodwill and Other Intangibles - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Carrying Value | $ 37,640 | $ 37,340 | $ 39,140 | $ 23,300
Accumulated Amortization | (16,149) | (11,311) | (7,395) | (2,108)
Net Book Value | $ 21,491 | $ 26,029 | 31,745 | $ 21,192
Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted-Average Useful Life (in years) |  |  |  | 1 year
Gross Carrying Value |  |  | 1,800 | $ 1,200
Accumulated Amortization |  |  | (1,800) | (1,095)
Net Book Value |  |  | $ 0 | $ 105
Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted-Average Useful Life (in years) | 10 years 18 days | 10 years 9 months 7 days | 11 years 6 months 11 days | 21 years
Gross Carrying Value | $ 34,940 | $ 34,940 | $ 34,940 | $ 20,400
Accumulated Amortization | (14,915) | (10,430) | (5,129) | (926)
Net Book Value | $ 20,025 | $ 24,510 | $ 29,811 | $ 19,474
Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted-Average Useful Life (in years) | 4 years 2 months 23 days | 8 years 3 months 11 days | 8 years 2 months 12 days |
Gross Carrying Value | $ 1,000 | $ 700 | $ 700 |
Accumulated Amortization | (434) | (287) | (113) |
Net Book Value | $ 566 | $ 413 | $ 587 |
Trade names and trademarks |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted-Average Useful Life (in years) | 6 years 22 days | 6 years 9 months 14 days | 7 years 6 months 18 days | 8 years 3 months 11 days
Gross Carrying Value | $ 1,700 | $ 1,700 | $ 1,700 | $ 1,700
Accumulated Amortization | (800) | (594) | (353) | (87)
Net Book Value | $ 900 | $ 1,106 | $ 1,347 | $ 1,613

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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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