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Investments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | $ 469,453 | $ 424,390
Investment Owned, at Fair Value | 469,747 | 407,637
Investment Owned, at Carrying Value | 469,747 | 407,637
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 89,052 | 116,393
Investment Owned, at Fair Value | 89,346 | 99,640
Investment Owned, at Carrying Value | 89,346 | 99,640
Cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 347,392 | 229,685
Investment Owned, at Fair Value | 347,392 | 229,685
Investment Owned, at Carrying Value | 347,392 | 229,685
Restricted cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 33,009 | 78,312
Investment Owned, at Fair Value | 33,009 | 78,312
Investment Owned, at Carrying Value | 33,009 | 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 | 3,192 | 3,179
Investment Owned, at Fair Value | 4,009 | 3,801
Investment Owned, at Carrying Value | 4,009 | 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 | 26,630 | 50,121
Investment Owned, at Fair Value | 26,130 | 38,816
Investment Owned, at Carrying Value | 26,130 | 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 | 10,914 | 6,077
Investment Owned, at Fair Value | 10,868 | 4,999
Investment Owned, at Carrying Value | 10,868 | 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 | 8,152 | 8,044
Investment Owned, at Fair Value | 8,215 | 6,945
Investment Owned, at Carrying Value | 8,215 | 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 | 21,748 | 28,311
Investment Owned, at Fair Value | 21,989 | 25,997
Investment Owned, at Carrying Value | 21,989 | 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 | 10,303 | 17,781
Investment Owned, at Fair Value | 10,265 | 16,878
Investment Owned, at Carrying Value | 10,265 | 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 | 4,939 |
Investment Owned, at Fair Value | 5,068 |
Investment Owned, at Carrying Value | 5,068 |
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 | 2,588 | 2,006
Investment Owned, at Fair Value | 2,506 | 1,710
Investment Owned, at Carrying Value | 2,506 | 1,710
Non- Hedging Derivative Instrument Asset Liability Net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 69 | 357
Investment Owned, at Fair Value | (21) | 123
Investment Owned, at Carrying Value | (21) | 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, at Carrying Value | $ 317 | $ 371

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