Intangible Assets as Direct Result from Cadent Acquisition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	$ 53,485	$ 53,485
Accumulated Amortization	(11,590)	(10,488)
Accumulated Impairment Loss	(19,258)	(19,258)
Net Carrying Value, ending balance	22,637	23,739
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	7,100	7,100
Accumulated Amortization	(1,249)	(1,100)
Accumulated Impairment Loss	(4,179)	(4,179)
Net Carrying Value, ending balance	1,672	1,821
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years	15 years
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	12,600	12,600
Accumulated Amortization	(2,591)	(2,236)
Accumulated Impairment Loss	(4,328)	(4,328)
Net Carrying Value, ending balance	5,681	6,036
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years	13 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	33,500	33,500
Accumulated Amortization	(7,701)	(7,112)
Accumulated Impairment Loss	(10,751)	(10,751)
Net Carrying Value, ending balance	15,048	15,637
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years	11 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	285	285
Accumulated Amortization	(49)	(40)
Accumulated Impairment Loss	0	0
Net Carrying Value, ending balance	$ 236	$ 245
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years	8 years