Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2013

Changes To Goodwill

Changes to goodwill are as follows:

(in thousands)	Six Months Ended June 30, 2013			Year Ended December 31, 2012
Balance at beginning of period	$	813,792		$	820,824
Disposals	—			(13,966		)
Currency translation	(11,345		)	6,934
Balance at end of period	$	802,447		$	813,792

Changes To Intangible Assets

Changes to intangible assets are as follows:

(in thousands)	Six Months Ended June 30, 2013			Year Ended December 31, 2012
Balance at beginning of period, net of accumulated amortization	$	125,913		$	146,227
Disposals	—			(3,789		)
Amortization expense	(8,289		)	(16,907		)
Currency translation and other	(3,034		)	382
Balance at end of period, net of accumulated amortization	$	114,590		$	125,913

Summary Of Intangible Assets

A summary of intangible assets follows:

	Weighted Average Amortization Period of Finite Lived Assets (in years)
		June 30, 2013						December 31, 2012
(in thousands)		Gross Asset		Accumulated Amortization		Net		Gross Asset		Accumulated Amortization		Net
Intellectual property rights	18.8	$	87,242	$	47,863	$	39,379	$	88,614	$	47,202	$	41,412
Customer relationships and backlog	11.6	136,749		77,325		59,424		140,250		73,630		66,620
Drawings	37.9	11,149		9,900		1,249		11,149		9,850		1,299
Other	14.0	50,451		35,913		14,538		51,093		34,511		16,582
Total	14.0	$	285,591	$	171,001	$	114,590	$	291,106	$	165,193	$	125,913