Customer List Intangible Assets
 4 Months Ended 5 Months Ended
Apr. 23, 2015
Sep. 30, 2015
Finite Lived Intangible Assets [Line Items]    
Customer List Intangible Assets  

Note 6. Customer List Intangible Assets

The carrying value of the customer list intangible assets is as follows:

 

 

September 30, 2015

 

 

 

Gross

 

 

Accumulated

 

 

Net Carrying

 

(Thousands)

 

Cost

 

 

Amortization

 

 

Value

 

Customer lists

 

$

34,501

 

 

$

(23,007

)

 

$

11,494

 

 

Amortization expense for the customer list intangible assets was $1.6 million for the period from April 24, 2015 to September 30, 2015. Amortization expense is estimated to be $2.6 million for the full year of 2015, $3.3 million in 2016, $2.6 million in 2017, $2.0 million in 2018 and $1.4 million in 2019.
Consumer CLEC Business    
Finite Lived Intangible Assets [Line Items]    
Customer List Intangible Assets

Note 4. Customer List Intangible Assets

The carrying value of the customer list intangible assets at December 31, 2014 was as follows:

 

 

 

December 31, 2014

 

 

 

Gross

 

 

Accumulated

 

 

Net Carrying

 

(Thousands)

 

Cost

 

 

Amortization

 

 

Value

 

Customer lists

 

$

34,501

 

 

$

(20,049

)

 

$

14,452

 

Amortization expense for the customer list intangible assets was $1.3 million for the period from January 1, 2015 to the Spin Date. Amortization expense for the customer list intangible assets was $1.1 million and $3.5 million for the three and nine months ended September 30, 2014, respectively