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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Intangible assets, net are summarized as follows:
 
 
December 31,
 
2016
 
2015
($ in thousands)
 
 
 
Definite-lived intangible assets, net:
 
 
 
Investment contracts
$
158,747

 
$
158,747

Accumulated amortization
(155,136
)
 
(152,676
)
Definite-lived intangible assets, net
3,611

 
6,071

Indefinite-lived intangible assets
34,816

 
34,816

Total intangible assets, net
$
38,427

 
$
40,887


 
Activity in goodwill and intangible assets, net is as follows:
 
 
Years Ended December 31,
 
2016
 
2015
 
2014
($ in thousands)
 
 
 
 
 
Intangible assets, net
 
 
 
 
 
Balance, beginning of period
$
40,887

 
$
41,783

 
$
44,633

Acquisition

 
2,400

 
1,075

Amortization expense
(2,460
)
 
(3,296
)
 
(3,925
)
Balance, end of period
$
38,427

 
$
40,887

 
$
41,783

Goodwill
 
 
 
 
 
Balance, beginning of period
$
6,701

 
$
5,260

 
$
5,260

Acquisition

 
1,441

 

Acquisition related adjustments
87

 

 

Balance, end of period
$
6,788

 
$
6,701

 
$
5,260



Definite-lived intangible asset amortization for the next five years is estimated as follows: 2017$0.8 million, 2018$0.6 million, 2019$0.5 million, 2020$0.4 million, 2021$0.4 million, and thereafter—$0.9 million. At December 31, 2016, the weighted average estimated remaining amortization period for definite-lived intangible assets is 6.8 years.