Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

The following table presents changes in the goodwill balance from December 31, 2018 to December 31, 2019:

	As of December 31,
(in thousands)	2019		2018
Balance, beginning of period	$	284,108	$	284,108
Goodwill recorded in acquisition		120,642		—
Balance, end of period	$	404,750	$	284,108

Summary of Definite Lived Intangible Assets

The following table presents a summary of definite‑lived intangible assets by type:

				Fund						Intellectual
	Customer			Advisory			Trade			Property/
(in thousands)	Relationships			Contracts			Names			Other			Totals
Gross book value - December 31, 2018	$	123,200		$	2,368		$	1,132		$	7,177		$	133,877
Accumulated amortization		(103,207	)		(2,368	)		(283	)		(6,940	)		(112,798	)
Net book value - December 31, 2018	$	19,993		$	—		$	849		$	237		$	21,079
Weighted average useful life (yrs)		0.8			—			1.5			0.2			0.8
Gross book value - December 31, 2019	$	123,200		$	2,368		$	39,332		$	7,547		$	172,447
Accumulated amortization		(118,577	)		(2,368	)		(5,607	)		(7,124	)		(133,676	)
Net book value - December 31, 2019	$	4,623		$	—		$	33,725		$	423		$	38,771
Weighted average useful life (yrs)		0.2			—			3.1			0.1			3.4

Summary of Estimated Amortization Expense for Definite Lived Intangible Assets

The following table presents estimated amortization expense for definite‑lived intangible assets for each of the five succeeding years and thereafter:

2020	$	12,830
2021		11,271
2022		9,568
2023		4,855
2024		143
Thereafter		104
Total	$	38,771

Schedule of Indefinite-lived Intangible Assets by Type

The following table presents a summary of indefinite‑lived intangible assets by type:

	Fund Advisory, Transfer
	Agent and Distribution		Trade
(in thousands)	Contracts		Names			Totals
December 31, 2017 balance	$	342,900	$	24,832		$	367,732
Additions or transfers		—		(1,132	)		(1,132	)
December 31, 2018 balance	$	342,900	$	23,700		$	366,600
Additions or transfers		770,100		—			770,100
December 31, 2019 balance	$	1,113,000	$	23,700		$	1,136,700