Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Assets
Investments in partnerships	$ 22,514	$ 23,704	$ 22,514	$ 23,704	$ 26,128
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance	966	925	1,037	954
Total Realized and Unrealized Gains or (Losses) in Income -Trading	(1)	83	(8)	81
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)	83	(8)	81
Purchases	3	14	3	75
Sales	(15)	0	(79)	(88)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	953	1,022	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	667	647	675	670
Total Realized and Unrealized Gains or (Losses) in Income -Trading	2	24	(6)	24
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	24	(6)	24
Purchases	0	0	0	57
Sales	0	0	0	(80)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	669	671	669	671
Trading - Other [Member]
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning Balance	299	278	362	284
Total Realized and Unrealized Gains or (Losses) in Income -Trading	(3)	59	(2)	57
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)	59	(2)	57
Purchases	3	14	3	18
Sales	(15)	0	(79)	(8)
Transfers In and/or (Out) of Level 3	0	0	0	0
Ending Balance	284	351	284	351
Recurring Basis [Member]
Assets
Cash equivalents	222,647	324,156	222,647	324,156	190,475
Investments in partnerships	22,513	23,704	22,513	23,704	26,128
Investments in securities:
AFS-Common stocks	33,478	32,815	33,478	32,815	33,560
AFS-Mutual Funds	1,484	2,013	1,484	2,013	1,702
Trading-Government obligations	27,996	50,139	27,996	50,139	42,989
Trading-Common Stocks	155,088	162,883	155,088	162,883	138,478
Trading-Mutual Funds	1,675	1,406	1,675	1,406	1,484
Trading-Other	719	374	719	374	630
Total investments in securities	220,440	249,630	220,440	249,630	218,843
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	49,162	56,171	49,162	56,171	58,511
AFS - Mutual Funds	3,168	3,371	3,168	3,371	3,341
Trading - Mutual Funds	11	19	11	19	20
Total investments in sponsored registered investment companies	52,341	59,561	52,341	59,561	61,872
Total investments	295,294	332,895	295,294	332,895	306,843
Total assets at fair value	517,941	657,051	517,941	657,051	497,318
Liabilities
Trading-Common Stocks	7,381	6,687	7,381	6,687	2,867
Trading-Other	217	323	217	323	269
Securities sold, not yet purchased	7,598	7,010	7,598	7,010	3,136
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	222,647	324,156	222,647	324,156	190,475
Investments in partnerships	0	0	0	0	0
Investments in securities:
AFS-Common stocks	33,478	32,815	33,478	32,815	33,560
AFS-Mutual Funds	1,484	2,013	1,484	2,013	1,702
Trading-Government obligations	27,996	50,139	27,996	50,139	42,989
Trading-Common Stocks	154,411	161,956	154,411	161,956	137,796
Trading-Mutual Funds	1,675	1,406	1,675	1,406	1,484
Trading-Other	98	23	98	23	120
Total investments in securities	219,142	248,352	219,142	248,352	217,651
Investments in sponsored registered investment companies: [Abstract]
AFS - Closed-end Funds	49,162	56,171	49,162	56,171	58,511
AFS - Mutual Funds	3,168	3,371	3,168	3,371	3,341
Trading - Mutual Funds	11	19	11	19	20
Total investments in sponsored registered investment companies	52,341	59,561	52,341	59,561	61,872
Total investments	271,483	307,913	271,483	307,913	279,523
Total assets at fair value	494,130	632,069	494,130	632,069	469,998
Liabilities
Trading-Common Stocks	7,381	6,687	7,381	6,687	2,867
Trading-Other	0	0	0	0	0
Securities sold, not yet purchased	7,381	6,687	7,381	6,687	2,867
Significant Other Observable Inputs (Level 2) [Member] \| Recurring Basis [Member]
Assets
Cash equivalents	0	0	0	0	0
Investments in partnerships	22,513	23,704	22,513	23,704	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	8	256	8	256	7
Trading-Mutual Funds	0	0	0	0	0
Trading-Other	337	0	337	0	148
Total investments in securities	345	256	345	256	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	22,858	23,960	22,858	23,960	26,283
Total assets at fair value	22,858	23,960	22,858	23,960	26,283
Liabilities
Trading-Common Stocks	0	0	0	0	0
Trading-Other	217	323	217	323	269
Securities sold, not yet purchased	217	323	217	323	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	669	671	669	671	675
Trading-Mutual Funds	0	0	0	0	0
Trading-Other	284	351	284	351	362
Total investments in securities	953	1,022	953	1,022	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	953	1,022	953	1,022	1,037
Total assets at fair value	953	1,022	953	1,022	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 Accounting Standards Codification

-Glossary Trading Securities

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

+ Details

Name:	us-gaap_TradingSecuritiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant