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Acquisitions (Narrative) (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) entity | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |
Number of businesses acquired | entity | 2 |
Titan Energy Worldwide Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Business acquisition, effective date of acquisition | Dec. 02, 2014 |
Equity method investment, ownership percentage |  | 100.00%
Transaction costs incurred |  | $ 700,000
Harmonics Holdings Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Business acquisition, effective date of acquisition | Jan. 16, 2015 |
Transaction costs incurred | $ 13,000 |

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