Acquisitions (Components of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Business Acquisition [Line Items]
Intangible assets	$ 3,600
Technology [Member]
Business Acquisition [Line Items]
Intangible assets	768
Weighted Average Useful Life (months)	36 months
Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets	95
Weighted Average Useful Life (months)	12 months
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	2,661
Weighted Average Useful Life (months)	48 months
Non-compete Agreements [Member]
Business Acquisition [Line Items]
Intangible assets	$ 76
Weighted Average Useful Life (months)	12 months