Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016, are as follows (in thousands):



	2017		2016
Goodwill balance at January 1	$	211,927	$	184,472
Effect of foreign exchange	2,641		82
Additions as the result of acquisitions	23,579		27,373
Goodwill balance at December 31	$	238,147	$	211,927

Other intangible assets

Other intangible assets at December 31, 2017 and 2016, consisted of the following (in thousands):



	2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents	$	16,528	$	(3,737	)	$	12,791
Distribution agreements	7,262		(4,686		)	2,576
License agreements	23,783		(5,568		)	18,215
Trademarks	16,224		(4,686		)	11,538
Covenants not to compete	1,028		(968		)	60
Customer lists	31,935		(18,482		)	13,453
In-process technology	920		—			920

Total	$	97,680	$	(38,127	)	$	59,553



	2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents	$	14,130	$	(3,165	)	$	10,965
Distribution agreements	6,626		(3,527		)	3,099
License agreements	20,695		(3,422		)	17,273
Trademarks	12,380		(3,330		)	9,050
Covenants not to compete	1,028		(936		)	92
Customer lists	22,261		(15,401		)	6,860
Royalty agreements	267		(267		)	—

Total	$	77,387	$	(30,048	)	$	47,339

Estimated amortization expense

Estimated amortization expense for the developed technology and other intangible assets for the next five years consists of the following as of December 31, 2017 (in thousands):



Year Ending December 31
2018	$	30,413
2019	29,787
2020	28,373
2021	21,001
2022	19,396