Intangible Assets Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

Intangible assets are summarized as follows (in thousands):

	Weighted Average Estimated Useful Life	December 31,
		2016			2015
Product technology	11 years	$	98,895		$	76,182
Customer relationships	11 years	87,013			69,272
Trademarks and trade name portfolios	14 years	8,160			7,540
Trade name portfolio not subject to amortization	indefinite	37,494			37,673
In-process research and development	n/a	4,700			2,250
Other	3 years	1,827			1,474
Acquired identifiable intangibles		238,089			194,391
Less accumulated amortization		(73,535		)	(58,173		)
Net acquired identifiable intangibles		164,554			136,218
Patents	7 years	6,083			6,104
Less accumulated amortization		(2,531		)	(1,671		)
Net patents		3,552			4,433
Acquired in-place leases and other	7 years	2,074			2,080
Less accumulated amortization		(1,720		)	(1,429		)
Net acquired in-place leases and other		354			651
		$	168,460		$	141,302

Estimated future aggregate amortization expense

For intangible assets recorded at December 31, 2016, the estimated future aggregate amortization expense for the years ending December 31, 2017 through 2021 is approximately (in thousands):

2017	$	23,594
2018	19,962
2019	19,041
2020	16,095
2021	14,411