Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Changes To Goodwill

Changes to goodwill are as follows:

	Nine Months Ended			Year Ended
(in thousands)	September 30, 2012			December 31, 2011
Balance at beginning of period	$	820,824		$	810,285
Additions	—			10,900
Disposals	(13,966		)	—
Adjustments to purchase price allocations	—			3,932
Currency translation	5,595			(4,293		)
Balance at end of period	$	812,453		$	820,824

Changes To Intangible Assets

Changes to intangible assets are as follows:

	Nine Months Ended			Year Ended
(in thousands)	September 30, 2012			December 31, 2011
Balance at beginning of period, net of accumulated amortization	$	146,227		$	162,636
Additions	—			5,980
Disposals	(3,789		)	—
Amortization expense	(13,987		)	(21,646		)
Currency translation and other	877			(743		)
Balance at end of period, net of accumulated amortization	$	129,328		$	146,227

Summary Of Intangible Assets

A summary of intangible assets follows:

	Weighted Average Amortization
	Period of Finite	September 30, 2012						December 31, 2011
(in thousands)	Lived Assets (in years)	Gross Asset		Accumulated Amortization		Net		Gross Asset		Accumulated Amortization		Net
Intellectual property rights	18.3	$	87,931	$	47,424	$	40,507	$	89,619	$	46,286	$	43,333
Customer relationships and backlog	11.9	140,402		71,195		69,207		146,291		66,256		80,035
Drawings	9.5	11,149		9,823		1,326		11,824		10,423		1,401
Other	14.2	50,655		32,367		18,288		52,155		30,697		21,458
Total	14.2	$	290,137	$	160,809	$	129,328	$	299,889	$	153,662	$	146,227