Business Acquisitions Intangible Assets Acquired (Details) (PECO and FGC Acquisitions [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	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