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Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | $ 529,525 | $ 424,390
Investment Owned, at Fair Value | 516,426 | 407,637
Investment Owned Carrying Value | 516,426 | 407,637
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 98,926 | 116,393
Investment Owned, at Fair Value | 85,827 | 99,640
Investment Owned Carrying Value | 85,827 | 99,640
Cash and Cash Equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 356,325 | 229,685
Investment Owned, at Fair Value | 356,325 | 229,685
Investment Owned Carrying Value | 356,325 | 229,685
Restricted Cash and Cash Equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 74,274 | 78,312
Investment Owned, at Fair Value | 74,274 | 78,312
Investment Owned Carrying Value | 74,274 | 78,312
U.S. Government Securities Obligations and Agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 3,342 | 3,179
Investment Owned, at Fair Value | 3,913 | 3,801
Investment Owned Carrying Value | 3,913 | 3,801
Equity Securities Common Stock Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 30,637 | 50,121
Investment Owned, at Fair Value | 23,546 | 38,816
Investment Owned Carrying Value | 23,546 | 38,816
Equity Securities Common Stock Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 11,854 | 6,077
Investment Owned, at Fair Value | 8,962 | 4,999
Investment Owned Carrying Value | 8,962 | 4,999
Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 2,904 | 8,044
Investment Owned, at Fair Value | 2,517 | 6,945
Investment Owned Carrying Value | 2,517 | 6,945
Equity Securities Exchange Traded and Mutual Funds Metals and Mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 24,140 | 28,311
Investment Owned, at Fair Value | 22,437 | 25,997
Investment Owned Carrying Value | 22,437 | 25,997
Equity Securities Exchange Traded and Mutual Funds Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 18,761 | 17,781
Investment Owned, at Fair Value | 18,172 | 16,878
Investment Owned Carrying Value | 18,172 | 16,878
Equity Securities Exchange Traded and Mutual Funds Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 4,420 |
Investment Owned, at Fair Value | 4,090 |
Investment Owned Carrying Value | 4,090 |
Equity Securities Exchange Traded and Mutual Funds Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 2,378 | 2,006
Investment Owned, at Fair Value | 1,989 | 1,710
Investment Owned Carrying Value | 1,989 | 1,710
Non-hedging derivative asset [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 147 | 357
Investment Owned, at Fair Value | 31 | 123
Investment Owned Carrying Value | 31 | 123
Non-hedging derivative (liability) [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | (174) |
Investment Owned, at Fair Value | (174) |
Investment Owned Carrying Value | (174) |
Other Investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 517 | 517
Investment Owned, at Fair Value | 344 | 371
Investment Owned Carrying Value | $ 344 | $ 371

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