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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill as of September 30, 2018 and December 31, 2017 was $147.0 million.  There were no changes in the carrying amount of goodwill during the three and nine month periods ending September 30, 2018.
 
Intangible assets as of September 30, 2018 and December 31, 2017 consisted of the following (in thousands): 
 
 
 
 
September 30, 2018
 
 
Amortization
Period
 
Cost
 
Accumulated
Amortization
 
Net
Customer Relationships
 
156 - 180 months
 
$
85,068

 
$
15,171

 
$
69,897

Non-Compete Agreement
 
36 months
 
26

 
14

 
12

Total
 
 
 
$
85,094

 
$
15,185

 
$
69,909

 
 
 
 
 
December 31, 2017
 
 
Amortization
Period
 
Cost
 
Accumulated
Amortization
 
Net
Customer Relationships
 
156 - 180 months
 
$
85,068

 
$
10,925

 
$
74,143

Non-Compete Agreement
 
36 months
 
26

 
4

 
22

Trade Name
 
24 months
 
3,000

 
3,000

 

Total
 
 
 
$
88,094

 
$
13,929

 
$
74,165


 
We recorded approximately $1.4 and $1.7 million in straight-line amortization expense of intangible assets for the three month periods ended September 30, 2018 and 2017, respectively. We recorded approximately $4.3 and $5.2 million in straight-line amortization expense of intangible assets for the nine month periods ended September 30, 2018 and 2017, respectively.  The Company records amortization expense as a general and administrative expense.  
The estimated amortization expense related to amortizable intangible assets for each of the five succeeding fiscal years and thereafter as of September 30, 2018 is as follows (in thousands):
 
Remainder of 2018
$
1,421

2019
5,680

2020
5,671

2021
5,671

2022
5,671

Thereafter
45,795

Total
$
69,909