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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Intangible Assets
Intangible assets consisted of customer relationships as follows:
 
June 30, 2017
 
December 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
$
67,348

 
$
66,307

 
$
67,317

 
$
63,216


The Company recorded the following aggregate amortization expense associated with intangibles:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Amortization expense
$
1,533

 
$
1,533

 
$
3,066

 
$
3,060


The following is a summary of the estimated annual amortization expense for the remainder of 2017 and each of the subsequent years:
2017
$
1,041

2018
$

2019
$

2020
$

2021
$