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Goodwill and Other Intangibles
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles
GOODWILL AND OTHER INTANGIBLES
At least annually on October 1st, and more frequently if warranted, the Company assesses it goodwill and indefinite lived intangible assets for impairment. No impairment losses were recorded for goodwill or indefinite lived intangible assets during the years ended December 31, 2017, 2016 and 2015. However, there can be no assurance that goodwill and indefinite lived intangibles will not be impaired at any time in the future.
Changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 are as follows (in thousands): 
 
 
December 31,
 
 
2017
 
2016
Balance at beginning of year
 
$
182,012

 
$
179,792

Translation adjustments
 
5,231

 
2,220

Balance at end of year
 
$
187,243

 
$
182,012


The following is a summary of the Company’s intangible assets other than goodwill (in thousands): 
 
 
 
 
December 31,
 
 
Amortization Period
 
2017
 
2016
Amortized intangible assets:
 
 
 
 
 
 
Cost:
 
 
 
 
 
 
Customer relationships
 
10 years
 
$
42,073

 
$
41,419

Internally developed software
 
7 years
 
7,412

 
6,925

 
 
 
 
49,485

 
48,344

Accumulated amortization:
 
 
 
 
 
 
Customer relationships
 
 
 
(42,073
)
 
(40,901
)
Internally developed software
 
 
 
(7,412
)
 
(6,925
)
 
 
 
 
(49,485
)
 
(47,826
)
Net book value
 
 
 

 
518

Indefinite-lived intangible assets:
 
 
 
 
 
 
Trade names
 
 
 
900

 
900

Total intangible assets at net book value
 
 
 
$
900

 
$
1,418



The Company’s trade name assets were determined to have indefinite lives due to the length of time the trade names have been in place. The Company’s current intentions are to maintain the trade names indefinitely. All other intangible assets were amortized on a straight-line basis over their expected useful lives and as of December 31, 2017, were fully amortized.
Amortization expense for the Company’s intangible assets was $0.5 million during the year ended December 31, 2017 and $4.2 million during each of the years ended December 31, 2016 and 2015.