Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

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 20, on a recurring basis as of December 31, 2013 and December 31, 2012 by fair value hierarchy level were as follows:

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

December 31, 2012
	Level 1		Level 2		Level 3		Total
($ in thousands)
Assets
Cash equivalents	$	62,289	$	—	$	—	$	62,289
Marketable securities trading:
Sponsored mutual funds and variable insurance funds		8,013		—		—		8,013
Equity securities		4,379		—		—		4,379
Marketable securities available for sale:
Sponsored closed-end funds		2,656		—		—		2,656
Other investments
Nonqualified retirement plan assets		2,970		—		—		2,970
Total assets measured at fair value	$	80,307	$	—	$	—	$	80,307