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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Intangible Assets
Intangible assets consisted of customer relationships as follows:
 
September 30, 2016
 
December 31, 2015
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
$
67,348

 
$
61,711

 
$
67,438

 
$
57,188


The Company recorded the following aggregate amortization expense associated with intangibles:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Amortization expense
$
1,533

 
$
2,655

 
$
4,593

 
$
8,001


The following is a summary of the estimated annual amortization expense for the remainder of 2016 and each of the subsequent years:
2016
$
1,533

2017
$
4,104

2018
$

2019
$

2020
$