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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net assets of acquired businesses. Goodwill is not amortized, but is evaluated for impairment on an annual basis, or more frequently if impairment indicators arise. The carrying value of goodwill as of December 31, 2016 and 2015 was $44.4 million.

Intangible Assets

Our intangible assets were acquired through acquisitions and are recorded at their fair values at the date of acquisition. Intangible assets with determinable lives are amortized on a straight-line basis over their estimated useful lives. The customer relationships have a weighted-average amortization period of 9.7 years. As of December 31, 2015, the Company’s non-compete agreements and certain of the Company’s customer relationship intangible assets had been fully amortized and the respective balances were written-off during 2016.

The following table sets forth the amounts of our identifiable intangible assets subject to amortization:
 
December 31,
 
2016
 
2015
 
(in thousands)
Customer relationships
$
29,081

 
$
35,781

Non-compete agreements

 
800

Total other intangibles, gross
$
29,081

 
$
36,581

Less accumulated amortization
14,672

 
19,473

Other intangibles, net
$
14,409

 
$
17,108



The following table sets forth the estimated amortization expense for intangibles subject to amortization for the next five years:
Period/Year
 
Customer
Relationships
 
Total
 
 
(in thousands)
2017
 
$
2,427

 
$
2,427

2018
 
$
2,328

 
$
2,328

2019
 
$
2,130

 
$
2,130

2020
 
$
2,130

 
$
2,130

2021
 
$
2,130

 
$
2,130

Thereafter
 
$
3,264

 
$
3,264



Amortization expense for the years ended December 31, 2016, 2015 and 2014 was $2.7 million, $3.2 million and $3.3 million, respectively.