Intangible Assets Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Intangible Assets [Abstract]

Intangible assets

Intangible assets are summarized as follows (in thousands):

	Weighted Average Estimated Useful Life	December 31,
		2014			2013
Product technology	11 years	$	67,620		$	69,919
Customer relationships	12 years	80,206			83,899
Trademarks and tradename portfolios	15 years	7,160			7,160
Tradename portfolio not subject to amortization	Indefinite	38,317			39,166
Other	5 years	21,562			21,996
Acquired identifiable intangibles		214,865			222,140
Less accumulated amortization		(87,997		)	(70,517		)
Net acquired identifiable intangibles		126,868			151,623
Patents	7 years	9,905			4,471
Less accumulated amortization		(4,544		)	(3,989		)
Net patents		5,361			482
Acquired in-place leases and other	7 years	9,309			9,333
Less accumulated amortization		(8,326		)	(7,243		)
Net acquired in-place leases and other		983			2,090
		$	133,212		$	154,195

Estimated future aggregate amortization expense

For intangible assets recorded at December 31, 2014, the estimated future aggregate amortization expense for the years ending December 31, 2015 through 2019 is approximately (in thousands):

2015	$	16,801
2016	12,416
2017	11,936
2018	10,194
2019	9,439