Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis, excluding the assets and liabilities of consolidated sponsored investment products discussed in Note 12, as of March 31, 2015 and December 31, 2014 by fair value hierarchy level were as follows:

March 31, 2015

	Level 1		Level 2		Level 3		Total
($ in thousands)
Assets
Cash equivalents	$	123,565	$	—	$	—	$	123,565
Marketable securities trading:
Sponsored funds		31,211		—		—		31,211
Equity securities		9,243		—		—		9,243
Marketable securities available for sale:
Sponsored closed-end funds		3,249		—		—		3,249
Other investments:
Nonqualified retirement plan assets		5,168		—		—		5,168
Total assets measured at fair value	$	172,436	$	—	$	—	$	172,436

December 31, 2014

	Level 1		Level 2		Level 3		Total
($ in thousands)
Assets
Cash equivalents	$	202,054	$	—	$	—	$	202,054
Marketable securities trading:
Sponsored funds		38,312		—		—		38,312
Equity securities		8,740		—		—		8,740
Marketable securities available for sale:
Sponsored closed-end funds		3,199		—		—		3,199
Other investments
Nonqualified retirement plan assets		5,063		—		—		5,063
Total assets measured at fair value	$	257,368	$	—	$	—	$	257,368