Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill and Intangible Assets, Net

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.