Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Assets
Investments in partnerships	$ 23,146	$ 24,976	$ 23,146	$ 24,976		$ 26,128
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance			1,037	954	953		1,022
Total Realized and Unrealized Gains or (Losses) in Income -Trading	(3)	21	(11)	102
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0	0	0
Total Realized and Unrealized Gains or (Losses)	(3)	21	(11)	102
Purchases	0	0	3	75
Sales	0	(18)	(79)	(106)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	950	1,025	950	1,025	953		1,022
Trading - Common stocks [Member]
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance			675	670	669		671
Total Realized and Unrealized Gains or (Losses) in Income -Trading	(2)	6	(8)	30
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0	0	0
Total Realized and Unrealized Gains or (Losses)	(2)	6	(8)	30
Purchases	0	0	0	57
Sales	0	0	0	(80)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	667	677	667	677	669		671
Trading - Other [Member]
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance			362	284	284		351
Total Realized and Unrealized Gains or (Losses) in Income -Trading	(1)	15	(3)	72
Total Realized and Unrealized Gains or (Losses) in Income - AFS Investments	0	0	0	0
Total Unrealized Gains or (Losses) Included in Other Comprehensive Income	0	0	0	0
Total Realized and Unrealized Gains or (Losses)	(1)	15	(3)	72
Purchases	0	0	3	18
Sales	0	(18)	(79)	(26)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	283	348	283	348	284		351
Recurring Basis [Member]
Assets
Cash equivalents	244,144	288,450	244,144	288,450		190,475
Investments in partnerships	23,146	24,976	23,146	24,976		26,128
Investments in securities:
AFS-Common stocks	36,297	32,239	36,297	32,239		33,560
AFS-Mutual Funds	1,575	1,673	1,575	1,673		1,702
Trading-Government obligations	21,000	28,742	21,000	28,742		42,989
Trading-Common Stocks	166,443	170,846	166,443	170,846		138,478
Trading-Mutual Funds	12,010	1,461	12,010	1,461		1,484
Trading-Other	419	484	419	484		630
Total investments in securities	237,744	235,445	237,744	235,445		218,843
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	40,272	60,731	40,272	60,731		58,511
AFS - Mutual Funds	3,404	3,468	3,404	3,468		3,341
Trading - Mutual Funds	12	24	12	24		20
Total investments in sponsored registered investment companies	43,688	64,223	43,688	64,223		61,872
Total investments	304,578	324,644	304,578	324,644		306,843
Total assets at fair value	548,722	613,094	548,722	613,094		497,318
Liabilities
Trading-Common Stocks	7,003	3,816	7,003	3,816		2,867
Trading-Other	722	40	722	40		269
Securities sold, not yet purchased	7,725	3,856	7,725	3,856		3,136
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	244,144	288,450	244,144	288,450		190,475
Investments in partnerships	0	0	0	0		0
Investments in securities:
AFS-Common stocks	36,297	32,239	36,297	32,239		33,560
AFS-Mutual Funds	1,575	1,673	1,575	1,673		1,702
Trading-Government obligations	21,000	28,742	21,000	28,742		42,989
Trading-Common Stocks	165,776	170,159	165,776	170,159		137,796
Trading-Mutual Funds	12,010	1,461	12,010	1,461		1,484
Trading-Other	32	59	32	59		120
Total investments in securities	236,690	234,333	236,690	234,333		217,651
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	40,272	60,731	40,272	60,731		58,511
AFS - Mutual Funds	3,404	3,468	3,404	3,468		3,341
Trading - Mutual Funds	12	24	12	24		20
Total investments in sponsored registered investment companies	43,688	64,223	43,688	64,223		61,872
Total investments	280,378	298,556	280,378	298,556		279,523
Total assets at fair value	524,522	587,006	524,522	587,006		469,998
Liabilities
Trading-Common Stocks	7,003	3,816	7,003	3,816		2,867
Trading-Other	0	0	0	0		0
Securities sold, not yet purchased	7,003	3,816	7,003	3,816		2,867
Significant Other Observable Inputs (Level 2) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	0	0	0	0		0
Investments in partnerships	23,146	24,976	23,146	24,976		26,128
Investments in securities:
AFS-Common stocks	0	0	0	0		0
AFS-Mutual Funds	0	0	0	0		0
Trading-Government obligations	0	0	0	0		0
Trading-Common Stocks	0	10	0	10		7
Trading-Mutual Funds	0	0	0	0		0
Trading-Other	104	77	104	77		148
Total investments in securities	104	87	104	87		155
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	0	0	0	0		0
AFS - Mutual Funds	0	0	0	0		0
Trading - Mutual Funds	0	0	0	0		0
Total investments in sponsored registered investment companies	0	0	0	0		0
Total investments	23,250	25,063	23,250	25,063		26,283
Total assets at fair value	23,250	25,063	23,250	25,063		26,283
Liabilities
Trading-Common Stocks	0	0	0	0		0
Trading-Other	722	40	722	40		269
Securities sold, not yet purchased	722	40	722	40		269
Significant Unobservable Inputs (Level 3) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	0	0	0	0		0
Investments in partnerships	0	0	0	0		0
Investments in securities:
AFS-Common stocks	0	0	0	0		0
AFS-Mutual Funds	0	0	0	0		0
Trading-Government obligations	0	0	0	0		0
Trading-Common Stocks	667	677	667	677		675
Trading-Mutual Funds	0	0	0	0		0
Trading-Other	283	348	283	348		362
Total investments in securities	950	1,025	950	1,025		1,037
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	0	0	0	0		0
AFS - Mutual Funds	0	0	0	0		0
Trading - Mutual Funds	0	0	0	0		0
Total investments in sponsored registered investment companies	0	0	0	0		0
Total investments	950	1,025	950	1,025		1,037
Total assets at fair value	950	1,025	950	1,025		1,037
Liabilities
Trading-Common Stocks	0	0	0	0		0
Trading-Other	0	0	0	0		0
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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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Balance Type:	debit
Period Type:	instant