Acquired Intangible Assets

6 Months Ended

Jun. 30, 2017

Acquired Intangible Assets [Abstract]

Acquired Intangible Assets

Note 7. Acquired Intangible Assets

Acquired identifiable intangible assets consist of the following:

	June 30, 2017			December 31, 2016
	(In thousands)
Customer relationships	$	87,333		$	87,070
Trademarks and trade names		6,800			6,800
Non-compete agreements		3,201			3,189
Patents		723			723
Supply agreements		800			800
Leaseholds		160			160
Total acquired intangible assets		99,017			98,742
Less accumulated amortization (1)		(40,031	)		(35,830	)
Net acquired intangible assets	$	58,986		$	62,912

(1) Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

Total amortization expense for acquired intangible assets was $2.1 million and $4.2 million for the three months and six months ended June 30, 2017, respectively, and $1.5 million and $2.7 million for the comparable periods in 2016.  Based on the current estimated useful lives assigned to our acquired intangible assets, amortization expense is estimated to be $3.8 million for the remainder of 2017, $7.6 million in 2018, $6.3 million in 2019, $5.9 million in 2020 and $30.2 million in the aggregate for the years 2021 through 2031.