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Investments - Schedule of investments, categorized by the level of the fair value hierarchy (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets    
Equity securities $ 948,667 $ 857,817
Private common equity securities 7,937 96,294
Total equities 956,604 954,111
Asset-backed securities 427,594 325,533
Bank debts 17,584 8,017
Corporate bonds 107,056 86,749
Municipal bonds 3,623 10,486
Sovereign debt 104,820 10,639
Total debt securities 660,677 441,424
Investments in limited partnerships 73,569 34,578
Options 10,821 13,069
Rights and warrants 271 1
Trade claims 11,058 17,681
Catastrophe bond 2,046  
Total other investments 97,765 65,329
Derivative assets, at fair value 37,260 39,045
Total assets 1,752,306 1,499,909
Liabilities    
Equity securities 8,682 5,207
Sovereign debt 19,440 37,592
Corporate bonds 4,368 3,372
Options 13,177 9,885
Total securities sold, not yet purchased 45,667 56,056
Derivative liabilities, at fair value 12,346 8,819
Derivative liabilities (embedded) 7,913 4,430
Total liabilities 65,926 69,305
Quoted prices in active markets (Level 1)
    
Assets    
Equity securities 929,946 839,903
Private common equity securities 0 0
Total equities 929,946 839,903
Asset-backed securities 0 0
Bank debts 0 0
Corporate bonds 0 0
Municipal bonds 0 0
Sovereign debt 0 0
Total debt securities 0 0
Investments in limited partnerships 0 0
Options 8,112 6,284
Rights and warrants 271 1
Trade claims 0 0
Catastrophe bond 0  
Total other investments 8,383 6,285
Derivative assets, at fair value 170 321
Total assets 938,499 846,509
Liabilities    
Equity securities 8,682 5,207
Sovereign debt 0 0
Corporate bonds 0 0
Options 8,096 4,714
Total securities sold, not yet purchased 16,778 9,921
Derivative liabilities, at fair value 121 441
Derivative liabilities (embedded) 0 0
Total liabilities 16,899 10,362
Significant other observable inputs (Level 2)
    
Assets    
Equity securities 18,721 17,914
Private common equity securities 7,937 94,282
Total equities 26,658 112,196
Asset-backed securities 425,160 325,133
Bank debts 17,584 8,017
Corporate bonds 103,092 82,139
Municipal bonds 3,623 10,486
Sovereign debt 104,801 10,639
Total debt securities 654,260 436,414
Investments in limited partnerships 66,799 29,286
Options 2,709 6,785
Rights and warrants 0 0
Trade claims 11,058 17,681
Catastrophe bond 2,046  
Total other investments 82,612 53,752
Derivative assets, at fair value 37,090 38,724
Total assets 800,620 641,086
Liabilities    
Equity securities 0 0
Sovereign debt 19,440 37,592
Corporate bonds 4,368 3,372
Options 5,081 5,171
Total securities sold, not yet purchased 28,889 46,135
Derivative liabilities, at fair value 11,992 8,378
Derivative liabilities (embedded) 0 0
Total liabilities 40,881 54,513
Significant unobservable inputs (Level 3)
    
Assets    
Equity securities 0 0
Private common equity securities 0 2,012
Total equities 0 2,012
Asset-backed securities 2,434 400
Bank debts 0 0
Corporate bonds 3,964 4,610
Municipal bonds 0 0
Sovereign debt 19 0
Total debt securities 6,417 5,010
Investments in limited partnerships 6,770 5,292
Options 0 0
Rights and warrants 0 0
Trade claims 0 0
Catastrophe bond 0  
Total other investments 6,770 5,292
Derivative assets, at fair value 0 0
Total assets 13,187 12,314
Liabilities    
Equity securities 0 0
Sovereign debt 0 0
Corporate bonds 0 0
Options 0 0
Total securities sold, not yet purchased 0 0
Derivative liabilities, at fair value 233 0
Derivative liabilities (embedded) 7,913 4,430
Total liabilities $ 8,146 $ 4,430