Intangible Assets as Direct Result from Cadent Acquisition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of March 31, 2013	$ 53,325
Accumulated Amortization	(8,638)
Accumulated Impairment Loss	(19,258)
Net Carrying Value as of March 31, 2013	25,429
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of March 31, 2013	7,100
Accumulated Amortization	(1,015)
Accumulated Impairment Loss	(4,179)
Net Carrying Value as of March 31, 2013	1,906
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of March 31, 2013	12,600
Accumulated Amortization	(1,860)
Accumulated Impairment Loss	(4,328)
Net Carrying Value as of March 31, 2013	6,412
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of March 31, 2013	33,500
Accumulated Amortization	(5,749)
Accumulated Impairment Loss	(10,751)
Net Carrying Value as of March 31, 2013	17,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of March 31, 2013	125
Accumulated Amortization	(14)
Accumulated Impairment Loss	0
Net Carrying Value as of March 31, 2013	$ 111
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years