Intangible Assets Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Intangible Assets [Abstract]

Intangible assets

Intangible assets are summarized as follows (in thousands):

	Weighted Average Estimated Useful Life	December 31,
		2011			2010
Product technology	10 years	$	95,123		$	88,078
Customer relationships	10 years	85,662			85,362
Trademarks and tradename portfolios	14 years	8,197			7,947
Tradename portfolio not subject to amortization	Indefinite	32,076			32,250
Other	4 years	24,530			23,010
Acquired identifiable intangibles		245,588			236,647
Less accumulated amortization		(88,588		)	(66,793		)
Net acquired identifiable intangibles		157,000			169,854
Patents	17 years	4,202			4,277
Less accumulated amortization		(3,478		)	(3,287		)
Net patents		724			990
Acquired in-place leases and other	7 years	12,882			10,881
Less accumulated amortization		(6,166		)	(4,340		)
Net acquired in-place leases and other		6,716			6,541
		$	164,440		$	177,385

Estimated future aggregate amortization expense

For intangible assets recorded at December 31, 2011, the estimated future aggregate amortization expense for the years ending December 31, 2012 through 2016 is approximately (in thousands):

2012	$	24,739
2013	22,840
2014	17,873
2015	13,755
2016	9,102