Restructuring and Reorganization Charges (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended							12 Months Ended
	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Employees	Dec. 31, 2014 USD ($) Employees	Dec. 31, 2013 USD ($) Employees	Dec. 31, 2012 USD ($)
Restructuring Cost And Reserve [Line Items]
Reduced workforce | Employees									160	60	160
Restructuring and reorganization charges recorded during the year		$ 1,300	$ 800	$ 400	$ 600	$ 4,900	$ 7,800	$ 1,200	$ 3,074	$ 13,969	$ 12,405
(Gain) loss on disposition of business operations									(3,733)	(222)	3,017
Adjustment for the loss on termination of pension plan											3,221
Cash payments									6,129	14,421	4,331
Asset impairment charge									1,685
Restructuring and reorganization reserve		2,994				$ 3,948			2,994	3,948	3,717	$ 2,370
Current Liabilities
Restructuring Cost And Reserve [Line Items]
Restructuring and reorganization reserve		$ 2,100							2,100
Cyber Security Business
Restructuring Cost And Reserve [Line Items]
(Gain) loss on disposition of business operations									(3,700)
Cyber Security Business | Subsequent Event
Restructuring Cost And Reserve [Line Items]
(Gain) loss on disposition of business operations	$ (6,600)
Abandonment of Office Facility
Restructuring Cost And Reserve [Line Items]
Restructuring and reorganization charges recorded during the year									1,200	1,100
Print operation
Restructuring Cost And Reserve [Line Items]
Restructuring and reorganization charges recorded during the year											3,600
Involuntary Terminations
Restructuring Cost And Reserve [Line Items]
Restructuring and reorganization charges recorded during the year									$ 4,500	5,600	$ 5,600
Termination costs
Restructuring Cost And Reserve [Line Items]
Cash payments										$ 8,000