GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Apr. 01, 2017

he components of amortized intangible assets at April 1, 2017 and December 31, 2016 were as follows:



	April 1, 2017
	Gross Carrying Amount		Accumulated Amortization		Weighted Average Life
Customer Relationships	$	192,743	$	115,792	13 years
Proprietary Software & Database	3,671		3,089		8 years
Patents & Proprietary Technology	6,485		3,566		11 years
Other	3,749		3,713		3 years
	$	206,648	$	126,160



	December 31, 2016
	Gross Carrying Amount		Accumulated Amortization		Weighted Average Life
Customer Relationships	$	191,316	$	111,342	13 years
Proprietary Software & Database	3,616		3,056		8 years
Patents & Proprietary Technology	6,434		3,420		11 years
Other	3,713		3,668		3 years
	$	205,079	$	121,486

Amortization expense for intangible assets for the thirteen weeks ended April 1, 2017 and March 26, 2016, respectively was as follows:

Estimated annual amortization expense related to finite‑lived intangible assets is as follows:



	Estimated Amortization Expense
2017	$	15,243
2018	13,560
2019	12,819
2020	11,749
2021	9,690

The carrying values of trade names at April 1, 2017 and December 31, 2016 were as follows:



	April 1, 2017		December 31, 2016		Year Acquired
Webforge	$	8,770	$	8,624	2010
Valmont SM	8,874		8,765		2014
Newmark	11,111		11,111		2004
Ingal EPS/Ingal Civil Products	7,150		7,032		2010
Donhad	5,394		5,305		2010
Shakespeare	4,000		4,000		2014
Industrial Galvanizers	2,238		2,201		2010
Other	13,975		13,747
	$	61,512	$	60,785

The carrying amount of goodwill by segment as of April 1, 2017 and December 31, 2016 was as follows:



	Engineered Support Structures Segment		Energy & Mining Segment		Utility Support Structures Segment		Coatings Segment		Irrigation Segment		Total
Balance at December 31, 2016	$	94,314	$	72,212	$	75,404	$	59,569	$	19,611	$	321,110
Foreign currency translation	765		1,946		—		127		113		2,951
Balance at April 1, 2017	$	95,079	$	74,158	$	75,404	$	59,696	$	19,724	$	324,061