Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Intangible Assets [Abstract]

Intangible Assets Other Than Goodwill

	2014						2013
(in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net		Useful Life (in years)	Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives:
Licenses	$	5,875	$	(5,875)	$	—	$	5,875	$	(5,875)	$	—	N/A	N/A
Patent costs		20,733		(7,369)		13,364		21,545		(5,960)		15,585	5 - 20	3
Acquired technology		57,383		(18,241)		39,142		30,095		(13,615)		16,480	3 - 10	4
Internally developed software		9,073		(5,517)		3,556		18,097		(12,863)		5,234	1 - 8	<1
Customer relationships		157,139		(36,975)		120,164		95,793		(18,283)		77,510	3 - 11	2
Non-compete agreements		35,469		(11,784)		23,685		16,848		(6,666)		10,182	3 - 11	3
Trade names		21,800		(4,455)		17,345		9,302		(2,211)		7,091	2 - 10	5
Other		39,100		(6,905)		32,195		11,598		(4,081)		7,517	4 - 10	1
Intangible assets with indefinite lives:
Trademarks		2,110		—		2,110		2,110		—		2,110	N/A	N/A
Total intangible assets	$	348,682	$	(97,121)	$	251,561	$	211,263	$	(69,554)	$	141,709	1 - 20	4