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Business Acquisitions Intangible Assets Acquired (Details) (PECO and FGC Acquisitions [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | $ 4,126
Acquired finite-lived intangible assets, weighted average useful life | 6 years 1 month 6 days
Order Backlog [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | 470
Acquired finite-lived intangible assets, weighted average useful life | 1 year
Trademarks [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | 90
Acquired finite-lived intangible assets, weighted average useful life | 2 years
Customer Relationships [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | 540
Acquired finite-lived intangible assets, weighted average useful life | 4 years
Developed Technology [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | 3,230
Acquired finite-lived intangible assets, weighted average useful life | 7 years
Revenues in excess of billings [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | 283
Acquired finite-lived intangible assets, weighted average useful life | 6 months
Assumed deferred revenue obligation [Member] |
Business Acquisition [Line Items] |
Finite-lived intangible assets acquired, amount | $ (487)
Acquired finite-lived intangible assets, weighted average useful life | 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=26713463&loc=d3e16265-109275 + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: 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=25498275&loc=d3e2207-128464 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant