Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Acquired Intangible Assets

The following table summarizes acquired intangible assets at December 31 as follows:

		2018				2017
(In thousands)	Weighted Average Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Patents	11 Years	$	2,146	$	1,716	$	2,146	$	1,629
Non-compete Agreement	4 Years	10,900		4,680		10,900		1,687
Trade Names	10 Years	11,454		5,182		11,492		4,114
Completed and Unpatented Technology	10 Years	36,406		14,964		38,114		11,931
Backlog	1 Years	8,790		8,790		14,424		12,184
Customer Relationships	15 Years	136,894		37,875		137,967		30,005
Total Intangible Assets	13 Years	$	206,590	$	73,207	$	215,043	$	61,550

Summary of Future Amortization Expense for Intangible Assets

Based upon acquired intangible assets at December 31, 2018, amortization expense for each of the next five years is estimated to be:

(In thousands)
2019	$	16,582
2020	$	15,909
2021	$	14,000
2022	$	13,576
2023	$	12,409