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Securities Available-for-Sale (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Reconciliation of available-for-sale securities from cost to fair value     
Amortized Cost$ 725,602,000 $ 725,602,000 $ 649,755,000
Gross Unrealized Gains84,823,000 84,823,000 192,753,000
Gross Unrealized Losses(24,230,000) (24,230,000) (3,614,000)
Estimated Fair Value786,195,000 786,195,000 838,894,000
Fair value on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months333,256,000 333,256,000  
12 Months or More21,638,000 21,638,000  
Total Estimated Fair Value354,894,000 354,894,000  
Unrealized losses on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months(23,518,000) (23,518,000)  
12 months or More(712,000) (712,000)  
Total Unrealized Losses(24,230,000) (24,230,000)  
Other-than-temporary impairment loss on corporate debt securities1,500,000500,0001,500,0001,700,000 
Estimated fair value of securities available-for-sale pledged as collateral     
Pledged as collateral for collateralized loan obligation secured debt and junior secured notes to affiliates690,336,000 690,336,000 728,558,000
Total690,336,000 690,336,000 728,558,000
Corporate debt securities
     
Reconciliation of available-for-sale securities from cost to fair value     
Amortized Cost712,118,000 712,118,000 646,638,000
Gross Unrealized Gains84,823,000 84,823,000 192,496,000
Gross Unrealized Losses(21,950,000) (21,950,000) (3,614,000)
Estimated Fair Value774,991,000 774,991,000 835,520,000
Fair value on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months322,052,000 322,052,000 41,656,000
12 Months or More21,638,000 21,638,000 36,631,000
Total Estimated Fair Value343,690,000 343,690,000 78,287,000
Unrealized losses on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months(21,238,000) (21,238,000) (1,331,000)
12 months or More(712,000) (712,000) (2,283,000)
Total Unrealized Losses(21,950,000) (21,950,000) (3,614,000)
Other-than-temporary impairment loss on corporate debt securities1,500,000500,0001,500,0001,700,000 
Estimated fair value of corporate debt securities in default    1,100,000
Available for sale securities in default from number of issuers    1
Net realized gains and losses recognized on the sale of securities     
Gross realized gains33,881,00017,598,00070,822,00060,398,000 
Gross realized losses  (477,000)  
Net realized gains33,881,00017,598,00070,345,00060,398,000 
Equity investments, at estimated fair value
     
Reconciliation of available-for-sale securities from cost to fair value     
Amortized Cost13,484,000 13,484,000 3,117,000
Gross Unrealized Gains    257,000
Gross Unrealized Losses(2,280,000) (2,280,000)  
Estimated Fair Value11,204,000 11,204,000 3,374,000
Fair value on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months11,204,000 11,204,000  
Total Estimated Fair Value11,204,000 11,204,000  
Unrealized losses on available for sale securities in a gross continuous unrealized loss position by the length of time     
Less Than 12 months(2,280,000) (2,280,000)  
Total Unrealized Losses(2,280,000) (2,280,000)  
Securities available-for-sale.
     
Concentrated risks     
Percentage of estimated fair value of available-for-sale securities concentrated in major issuers (as a percent)47.00% 47.00% 60.00%
Number of issuers with whom a specified percentage of estimated fair value of available-for-sale securities is concentrated10 10 10
First Data Corporation and SandRidge Energy, Inc.
     
Reconciliation of available-for-sale securities from cost to fair value     
Estimated Fair Value127,000,000 127,000,000  
Concentrated risks     
Percentage of estimated fair value of available-for-sale securities concentrated in major issuers (as a percent)16.00% 16.00%  
Number of issuers with whom a specified percentage of estimated fair value of available-for-sale securities is concentrated2 2  
NXP BV and First Data Corporation
     
Reconciliation of available-for-sale securities from cost to fair value     
Estimated Fair Value    $ 208,600,000
Concentrated risks     
Percentage of estimated fair value of available-for-sale securities concentrated in major issuers (as a percent)    25.00%
Number of issuers with whom a specified percentage of estimated fair value of available-for-sale securities is concentrated    2