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Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | $ 499,497 | $ 476,972
Investment Owned, at Fair Value | 499,497 | 469,747
Investment Owned, at Carrying Value | 499,497 | 469,747
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost |  | 96,571
Investment Owned, at Fair Value |  | 89,346
Investment Owned, at Carrying Value |  | 89,346
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 13,968 |
Investment Owned, at Fair Value | 13,968 |
Investment Owned, at Carrying Value | 13,968 |
Cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 482,876 | 347,392
Investment Owned, at Fair Value | 482,876 | 347,392
Investment Owned, at Carrying Value | 482,876 | 347,392
Restricted cash and cash equivalents [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 2,653 | 33,009
Investment Owned, at Fair Value | 2,653 | 33,009
Investment Owned, at Carrying Value | 2,653 | 33,009
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
Investment Owned, at Fair Value |  | 4,009
Investment Owned, at Carrying Value |  | 4,009
U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 8,004 |
Investment Owned, at Fair Value | 8,013 |
Investment Owned, at Carrying Value | 8,013 |
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 |  | 31,113
Investment Owned, at Fair Value |  | 26,130
Investment Owned, at Carrying Value |  | 26,130
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 |  | 12,053
Investment Owned, at Fair Value |  | 10,868
Investment Owned, at Carrying Value |  | 10,868
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 |  | 8,416
Investment Owned, at Fair Value |  | 8,215
Investment Owned, at Carrying Value |  | 8,215
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 |  | 22,687
Investment Owned, at Fair Value |  | 21,989
Investment Owned, at Carrying Value |  | 21,989
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 |  | 10,705
Investment Owned, at Fair Value |  | 10,265
Investment Owned, at Carrying Value |  | 10,265
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 |  | 4,992
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 |  | 2,827
Investment Owned, at Fair Value |  | 2,506
Investment Owned, at Carrying Value |  | 2,506
Non-hedging derivative 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
Investment Owned, at Fair Value |  | (21)
Investment Owned, at Carrying Value |  | (21)
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
Investment Owned, at Fair Value |  | 317
Investment Owned, at Carrying Value |  | 317
Corporate bonds [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
Investment holdings by type of instrument |  |
Investment Owned, at Cost or Amortized Cost | 5,964 |
Investment Owned, at Fair Value | 5,955 |
Investment Owned, at Carrying Value | $ 5,955 |

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