Accrued Restructuring (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring and Related Activities [Abstract]
Employee-related restructuring expenses	$ 1,468	$ 5,463	$ 2,769
Fair value adjustments to contingent consideration liability	(156)	(1,740)	(5,052)
Facility reductions	0	602	1,590
Write off of purchased computer software	0	2,868	0
Net gain from sale of OS-9 software assets	0	(1,532)	0
Integration-related expenses	2,097	1,039	576
Non-recurring legal expenses	796	779	0
Restructuring and other charges, net	$ 4,205	$ 7,479	$ (117)	[1]

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