Intangible Assets as Direct Result from Cadent Acquisition (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	$ 59,516	$ 53,485
Accumulated Amortization	(17,628)	(16,139)
Accumulated Impairment Loss	(19,258)	(19,258)
Net Carrying Value, ending balance	$ 22,630	$ 18,088
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	14 years	15 years
Gross Carrying Amount, beginning balance	$ 7,100	$ 7,100
Accumulated Amortization	(1,561)	(1,492)
Accumulated Impairment Loss	(4,179)	(4,179)
Net Carrying Value, ending balance	$ 1,360	$ 1,429
Existing technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	13 years	13 years
Gross Carrying Amount, beginning balance	$ 12,600	$ 12,600
Accumulated Amortization	(3,859)	(3,577)
Accumulated Impairment Loss	(4,328)	(4,328)
Net Carrying Value, ending balance	$ 4,413	$ 4,695
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years	11 years
Gross Carrying Amount, beginning balance	$ 33,500	$ 33,500
Accumulated Amortization	(11,888)	(10,957)
Accumulated Impairment Loss	(10,751)	(10,751)
Net Carrying Value, ending balance	$ 10,861	$ 11,792
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	8 years	8 years
Gross Carrying Amount, beginning balance	$ 6,316	$ 285
Accumulated Amortization	(320)	(113)
Accumulated Impairment Loss	0	0
Net Carrying Value, ending balance	$ 5,996	$ 172