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Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | $ 518,827 | $ 424,390
Investment Owned, at Fair Value | 514,111 | 407,637
Investment Owned Carrying Value | 514,111 | 407,637
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 58,017 | 116,393
Investment Owned, at Fair Value | 53,301 | 99,640
Investment Owned Carrying Value | 53,301 | 99,640
Cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 365,675 | 229,685
Investment Owned, at Fair Value | 365,675 | 229,685
Investment Owned Carrying Value | 365,675 | 229,685
Restricted cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 95,135 | 78,312
Investment Owned, at Fair Value | 95,135 | 78,312
Investment Owned Carrying Value | 95,135 | 78,312
U.S. government 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 | 3,193 | 3,179
Investment Owned, at Fair Value | 4,008 | 3,801
Investment Owned Carrying Value | 4,008 | 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 | 11,709 | 50,121
Investment Owned, at Fair Value | 9,235 | 38,816
Investment Owned Carrying Value | 9,235 | 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 | 9,968 | 6,077
Investment Owned, at Fair Value | 8,067 | 4,999
Investment Owned Carrying Value | 8,067 | 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 | 10,359 | 8,044
Investment Owned, at Fair Value | 9,989 | 6,945
Investment Owned Carrying Value | 9,989 | 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 | 6,297 | 28,311
Investment Owned, at Fair Value | 6,527 | 25,997
Investment Owned Carrying Value | 6,527 | 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 | 7,046 | 17,781
Investment Owned, at Fair Value | 7,015 | 16,878
Investment Owned Carrying Value | 7,015 | 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 | 2,880 |
Investment Owned, at Fair Value | 2,935 |
Investment Owned Carrying Value | 2,935 |
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 | 5,774 | 2,006
Investment Owned, at Fair Value | 5,107 | 1,710
Investment Owned Carrying Value | 5,107 | 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 | 274 | 357
Investment Owned, at Fair Value | 101 | 123
Investment Owned Carrying Value | 101 | 123
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 | 317 | 371
Investment Owned Carrying Value | $ 317 | $ 371

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