Goodwill and Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,760	$ 12,180
Accumulated Amortization	5,503	9,412
Impairment	486
Net Carrying Amount	6,771	2,768
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,780	11,260
Accumulated Amortization	5,015	8,696
Impairment	448
Net Carrying Amount	6,317	2,564
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	60	30
Accumulated Amortization	34	30
Impairment	26
Net Carrying Amount	0	0
Trademarks and Tradenames [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	50	40
Accumulated Amortization	31	40
Impairment	9
Net Carrying Amount	10	0
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	870	850
Accumulated Amortization	423	646
Impairment	3
Net Carrying Amount	$ 444	$ 204