Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Assets
Investments in partnerships	$ 24,080	$ 23,772	$ 25,253
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance	984	1,037
Total Realized and Unrealized Gains or (Losses) in Income -Trading	0	(7)
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0
Total Realized and Unrealized Gains or (Losses)	0	(7)
Purchases	0	0
Sales	0	(64)
Transfers In and/or (Out) of Level 3	0	0
Ending Balance	984	966
Trading - Common stocks [Member]
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance	700	675
Total Realized and Unrealized Gains or (Losses) in Income -Trading	0	(8)
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0
Total Realized and Unrealized Gains or (Losses)	0	(8)
Purchases	0	0
Sales	0	0
Transfers In and/or (Out) of Level 3	0	0
Ending Balance	700	667
Trading - Other [Member]
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance	284	362
Total Realized and Unrealized Gains or (Losses) in Income -Trading	0	1
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0
Total Realized and Unrealized Gains or (Losses)	0	1
Purchases	0	0
Sales	0	(64)
Transfers In and/or (Out) of Level 3	0	0
Ending Balance	284	299
Recurring Basis [Member]
Assets
Cash equivalents	242,917	272,653	209,913
Investments in partnerships	24,080	23,772	25,253
Investments in securities:
AFS-Common stocks	41,538	35,225	43,046
AFS-Mutual Funds	1,448	1,734	1,687
Trading-Government obligations	25,999	49,990	37,994
Trading-Common Stocks	141,276	139,503	124,634
Trading-Mutual Funds	23,404	1,655	23,285
Trading-Other	749	1,179	582
Total investments in securities	234,414	229,286	231,228
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	38,980	60,895	40,624
AFS - Mutual Funds	3,441	3,382	3,408
Trading - Mutual Funds	12	17	10
Total investments in sponsored registered investment companies	42,433	64,294	44,042
Total investments	300,927	317,352	300,523
Total assets at fair value	543,844	590,005	510,436
Liabilities
Trading-Common Stocks	10,469	5,650	6,023
Trading-Other	319	727	155
Securities sold, not yet purchased	10,788	6,377	6,178
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	242,917	272,653	209,913
Investments in partnerships	0	0	0
Investments in securities:
AFS-Common stocks	41,538	35,225	43,046
AFS-Mutual Funds	1,448	1,734	1,687
Trading-Government obligations	25,999	49,990	37,994
Trading-Common Stocks	140,575	138,829	123,927
Trading-Mutual Funds	23,404	1,655	23,285
Trading-Other	253	92	23
Total investments in securities	233,217	227,525	229,962
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	38,980	60,895	40,624
AFS - Mutual Funds	3,441	3,382	3,408
Trading - Mutual Funds	12	17	10
Total investments in sponsored registered investment companies	42,433	64,294	44,042
Total investments	275,650	291,819	274,004
Total assets at fair value	518,567	564,472	483,917
Liabilities
Trading-Common Stocks	10,469	5,650	6,023
Trading-Other	0	0	0
Securities sold, not yet purchased	10,469	5,650	6,023
Significant Other Observable Inputs (Level 2) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	0	0	0
Investments in partnerships	24,080	23,772	25,253
Investments in securities:
AFS-Common stocks	0	0	0
AFS-Mutual Funds	0	0	0
Trading-Government obligations	0	0	0
Trading-Common Stocks	1	7	7
Trading-Mutual Funds	0	0	0
Trading-Other	212	788	275
Total investments in securities	213	795	282
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	0	0	0
AFS - Mutual Funds	0	0	0
Trading - Mutual Funds	0	0	0
Total investments in sponsored registered investment companies	0	0	0
Total investments	24,293	24,567	25,535
Total assets at fair value	24,293	24,567	25,535
Liabilities
Trading-Common Stocks	0	0	0
Trading-Other	319	727	155
Securities sold, not yet purchased	319	727	155
Significant Unobservable Inputs (Level 3) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	0	0	0
Investments in partnerships	0	0	0
Investments in securities:
AFS-Common stocks	0	0	0
AFS-Mutual Funds	0	0	0
Trading-Government obligations	0	0	0
Trading-Common Stocks	700	667	700
Trading-Mutual Funds	0	0	0
Trading-Other	284	299	284
Total investments in securities	984	966	984
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	0	0	0
AFS - Mutual Funds	0	0	0
Trading - Mutual Funds	0	0	0
Total investments in sponsored registered investment companies	0	0	0
Total investments	984	966	984
Total assets at fair value	984	966	984
Liabilities
Trading-Common Stocks	0	0	0
Trading-Other	0	0	0
Securities sold, not yet purchased	$ 0	$ 0	$ 0

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