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Business Acquisitions Acquired Intangible Assets (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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Apr. 30, 2014 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Useful Life (Years) |  | 5 years
PECO and FGC Acquisitions |  |
Business Acquisition [Line Items] |  |
Amount | $ (5,158) |
Useful Life (Years) | 5 years 3 months 18 days |
PECO and FGC Acquisitions | Order backlog |  |
Business Acquisition [Line Items] |  |
Amount | $ (1,172) |
Useful Life (Years) | 1 year |
PECO and FGC Acquisitions | Trademarks |  |
Business Acquisition [Line Items] |  |
Amount | $ (90) |
Useful Life (Years) | 2 years |
PECO and FGC Acquisitions | Customer relationships |  |
Business Acquisition [Line Items] |  |
Amount | $ (870) |
Useful Life (Years) | 4 years |
PECO and FGC Acquisitions | Developed technology |  |
Business Acquisition [Line Items] |  |
Amount | $ (3,230) |
Useful Life (Years) | 7 years |
PECO and FGC Acquisitions | Net assumed contractual obligations |  |
Business Acquisition [Line Items] |  |
Amount | $ (204) |
Useful Life (Years) | 1 year |

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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://www.xbrl.org/2003/role/presentationRef -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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- 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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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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