Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	$ 155,127	$ 138,732
Amortizable intangible assets, accumulated amortization	(100,912)	(86,466)
Amortizable intangible assets, net carrying amount	54,215	52,266
Amortizable intangible assets, weighted average remaining life (Years)	11 years 9 months 18 days	12 years 3 months 18 days
Non-amortizable intangible assets	13,027	13,027
Gross carrying amount	168,154	151,759
Net carrying amount	67,242	65,293
Patents and acquired technology
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	78,253	68,500
Amortizable intangible assets, accumulated amortization	(62,010)	(56,327)
Amortizable intangible assets, net carrying amount	16,243	12,173
Amortizable intangible assets, weighted average remaining life (Years)	7 years 6 months	5 years 3 months 18 days
Customer Relationships
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	63,029	55,585
Amortizable intangible assets, accumulated amortization	(31,531)	(24,340)
Amortizable intangible assets, net carrying amount	31,498	31,245
Amortizable intangible assets, weighted average remaining life (Years)	14 years 8 months 12 days	13 years 10 months 24 days
Customer Backlog
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	1,810	1,269
Amortizable intangible assets, accumulated amortization	(1,641)	(1,269)
Amortizable intangible assets, net carrying amount	169
Amortizable intangible assets, weighted average remaining life (Years)	2 months 12 days	0 years
Non-compete Covenant
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	1,830
Amortizable intangible assets, accumulated amortization	(366)
Amortizable intangible assets, net carrying amount	1,464
Amortizable intangible assets, weighted average remaining life (Years)	4 years 2 months 12 days
Trademarks and Trade Names
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	10,205	13,378
Amortizable intangible assets, accumulated amortization	(5,364)	(4,530)
Amortizable intangible assets, net carrying amount	$ 4,841	$ 8,848
Amortizable intangible assets, weighted average remaining life (Years)	9 years 9 months 18 days	16 years 4 months 24 days