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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
There were no changes in the carrying amount of goodwill during the periods presented. Goodwill is reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during the periods presented.

Other Intangible Assets
The following table presents the components of other intangible assets:
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Useful Lives
 
(Amounts in thousands)
 
(in years)
As of December 31, 2016:
 
 
 
 
 
 
 
Customer relationships
$
52,430

 
$
(39,332
)
 
$
13,098

 
11
Trade names
15,400

 
(5,133
)
 
10,267

 
24
Technology
4,300

 
(3,440
)
 
860

 
10
Insurance license
1,400

 

 
1,400

 
Indefinite
Total intangible assets, net
$
73,530

 
$
(47,905
)
 
$
25,625

 
 
 
 
 
 
 
 
 
 
As of December 31, 2015:
 
 
 
 
 
 
 
Customer relationships
$
52,430

 
$
(34,327
)
 
$
18,103

 
11
Trade names
15,400

 
(4,491
)
 
10,909

 
24
Technology
4,300

 
(3,010
)
 
1,290

 
10
Insurance license
1,400

 

 
1,400

 
Indefinite
Total intangible assets, net
$
73,530

 
$
(41,828
)
 
$
31,702

 
 


In 2015, the Company recognized $1.4 million of other intangible assets for a state insurance license related to the acquisition of Workmen's Auto Insurance Company. See Note 20. Acquisition for the acquisition's cost allocation.

Other intangible assets are reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during any of the periods presented.

Other intangible assets with definite useful lives are amortized on a straight-line basis over their useful lives. Other intangible assets amortization expense was $6.1 million, $6.0 million, and $6.0 million in the years ended December 31, 2016, 2015, and 2014, respectively. None of the intangible assets with definite useful lives are anticipated to have a residual value.

The following table presents the estimated future amortization expense related to other intangible assets as of December 31, 2016:
Year Ending December 31,
Amortization Expense
 
(Amounts in thousands)
2017
$
5,349

2018
5,335

2019
4,906

2020
758

2021
738

Thereafter
7,139

Total
$
24,225