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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
 
The balance of goodwill, all of which is within the Empower Retirement (formerly known as “Retirement Services”) segment, is as follows:

 
 
Goodwill
 
 
2015
 
2014
Balances, January 1
 
$
137,683

 
$
105,255

Acquisitions (1)
 

 
32,428

Balances, December 31
 
$
137,683

 
$
137,683


(1) During 2014, the Company acquired goodwill of $32,428 from the acquisition of RPS. See Note 2 for additional discussion regarding the acquisition.
 
The following tables summarize other intangible assets, all of which are within the Empower Retirement segment:
 
 
 
December 31, 2015
 
 
Gross carrying
 
Accumulated
 
 
 
 
amount
 
amortization
 
Net book value
Customer relationships
 
$
47,580

 
$
(24,251
)
 
$
23,329

Non-competition
 
1,325

 
(835
)
 
490

Total
 
$
48,905

 
$
(25,086
)
 
$
23,819

 
 
 
December 31, 2014
 
 
Gross carrying
 
Accumulated
 
 
 
 
amount
 
amortization
 
Net book value
Customer relationships (1)
 
$
51,280

 
$
(24,481
)
 
$
26,799

Non-competition (1)
 
1,325

 
(209
)
 
1,116

Total
 
$
52,605

 
$
(24,690
)
 
$
27,915


(1) During 2014, the Company acquired $14,966 and $1,325 of customer relationship and non-competition intangible assets, respectively, from the acquisition of RPS. See Note 2 for additional discussion regarding the acquisition.

Amortization expense for other intangible assets included in general insurance expenses was $4,096, $3,531, and $3,094 for the years ended December 31, 2015, 2014, and 2013, respectively.  Except for goodwill, the Company has no intangible assets with indefinite lives. 
 
The estimated future amortization of other intangible assets using current assumptions, which are subject to change, for the years ended December 31, 2016, through December 31, 2020, is approximately $2,800 per annum.