Goodwill and Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross	$ 40,605	$ 45,281
Accumulated amortization	(19,490)	(19,442)
Net	21,115	25,839
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 4 months
Gross	6,783	7,273
Accumulated amortization	(78)	(46)
Net	6,705	7,227
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 0 months
Weighted Average Useful Life (years)	6 years
Gross	17,159	18,702
Accumulated amortization	(10,841)	(10,163)
Net	6,318	8,539
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 1 month
Gross	5,502	7,837
Accumulated amortization	(918)	(2,433)
Net	4,584	5,404
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 2 months
Gross	10,900	10,900
Accumulated amortization	(7,448)	(6,359)
Net	3,452	4,541
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 0 months
Gross	261	569
Accumulated amortization	(205)	(441)
Net	$ 56	$ 128