Intangible Assets Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Intangible Assets [Abstract]

Intangible assets

Intangible assets are summarized as follows (in thousands):

	Weighted Average Estimated Useful Life	December 31,
		2012			2011
Product technology	11 years	$	89,818		$	89,722
Customer relationships	11 years	64,083			67,862
Trademarks and tradename portfolios	15 years	7,160			7,910
Tradename portfolio not subject to amortization	Indefinite	32,076			32,076
Other	5 years	20,380			21,920
Acquired identifiable intangibles		213,517			219,490
Less accumulated amortization		(78,328		)	(62,490		)
Net acquired identifiable intangibles		135,189			157,000
Patents	17 years	4,464			4,202
Less accumulated amortization		(3,960		)	(3,478		)
Net patents		504			724
Acquired in-place leases and other	7 years	12,971			12,882
Less accumulated amortization		(8,043		)	(6,166		)
Net acquired in-place leases and other		4,928			6,716
		$	140,621		$	164,440

Estimated future aggregate amortization expense

For intangible assets recorded at December 31, 2012, the estimated future aggregate amortization expense for the years ending December 31, 2013 through 2017 is approximately (in thousands):

2013	$	22,892
2014	18,055
2015	13,856
2016	9,094
2017	8,355