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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
($ in thousands)
 
 
 
Definite-lived intangible assets, net:
 
 
 
Investment contracts
$
425,747

 
$
158,747

Accumulated amortization
(167,309
)
 
(155,136
)
Definite-lived intangible assets, net
258,438

 
3,611

Indefinite-lived intangible assets
43,516

 
34,816

Total intangible assets, net
$
301,954

 
$
38,427


 
Activity in goodwill and intangible assets, net is as follows: 
 
Years Ended December 31,
 
2017
 
2016
 
2015
($ in thousands)
 
 
 
 
 
Intangible assets, net
 
 
 
 
 
Balance, beginning of period
$
38,427

 
$
40,887

 
$
41,783

Acquisitions (1)
275,700

 

 
2,400

Amortization expense
(12,173
)
 
(2,460
)
 
(3,296
)
Balance, end of period
$
301,954

 
$
38,427

 
$
40,887

Goodwill
 
 
 
 
 
Balance, beginning of period
$
6,788

 
$
6,701

 
$
5,260

Acquisition (1)
163,365

 

 
1,441

Acquisition related adjustments

 
87

 

Balance, end of period
$
170,153

 
$
6,788

 
$
6,701



(1) - See Note 3 for details on the acquired intangible assets.

Definite-lived intangible asset amortization for the next five years is estimated as follows: 2018$20.1 million, 2019$20.0 million, 2020$19.9 million, 2021$19.9 million, 2022$19.7 million, and thereafter—$158.8 million. At December 31, 2017, the weighted average estimated remaining amortization period for definite-lived intangible assets is 13.7 years.