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Intangible Assets (Tables)

3 Months Ended

Mar. 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)		$	—
Patent costs		21,714			(6,113)			15,601			21,545			(5,960)			15,585		6 - 7		3
Acquired technology		32,498			(14,185)			18,313			30,095			(13,615)			16,480		5 - 10		5
Internally developed software		17,847			(13,223)			4,624			18,097			(12,863)			5,234		5		<1
Customer relationships		99,966			(24,089)			75,877			95,793			(18,283)			77,510		5 - 13		5
Non-compete agreements		20,445			(7,635)			12,810			16,848			(6,666)			10,182		3 - 11		3
Trade names		10,627			(2,834)			7,793			9,302			(2,211)			7,091		2 - 10		3
Other		18,637			(4,819)			13,818			11,598			(4,081)			7,517		<1 - 7		2
Intangible assets with indefinite lives:
Trademarks		2,110			—			2,110			2,110			—			2,110		N/A		N/A
Total intangible assets	$	229,719		$	(78,773)		$	150,946		$	211,263		$	(69,554)		$	141,709		<1 - 13		4

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