Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

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, excluding the assets and liabilities of consolidated sponsored investment products discussed in Note 10, on a recurring basis as of March 31, 2014 and December 31, 2013 by fair value hierarchy level were as follows:

March 31, 2014

	Level 1		Level 2		Level 3		Total
($ in thousands)
Assets
Cash equivalents	$	234,181	$	—	$	—	$	234,181
Marketable securities trading:
Sponsored mutual funds and variable insurance funds		82,198		—		—		82,198
Equity securities		8,910		—		—		8,910
Marketable securities available for sale:
Sponsored closed-end funds		2,841		—		—		2,841
Other investments:
Nonqualified retirement plan assets		4,299		—		—		4,299
Total assets measured at fair value	$	332,429	$	—	$	—	$	332,429

December 31, 2013

	Level 1		Level 2		Level 3		Total
($ in thousands)
Assets
Cash equivalents	$	270,262	$	—	$	—	$	270,262
Marketable securities trading:
Sponsored mutual funds and variable insurance funds		17,904		—		—		17,904
Equity securities		8,379		—		—		8,379
Marketable securities available for sale:
Sponsored closed-end funds		2,685		—		—		2,685
Other investments:
Nonqualified retirement plan assets		4,220		—		—		4,220
Total assets measured at fair value	$	303,450	$	—	$	—	$	303,450