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Consolidated Statement Of Changes In Shareholders' Equity (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
CHANGE IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS    
Net investment income (loss)$ 10,977$ 4,322$ 33,649$ 18,462
Net realized gain (loss) on investments and financial derivatives7,974(7,146)15,66210,782
Change in net unrealized gain (loss) on investments and financial derivatives(20,111)18,842(40,685)(1,899)
Net increase (decrease) in shareholders' equity resulting from operations(1,160)16,0188,62627,345
CHANGE IN SHAREHOLDERS' EQUITY RESULTING FROM SHAREHOLDER TRANSACTIONS    
Shares issued in connection with incentive fee payment  203275
Dividends paid(6,752)(1,855)(35,634)(20,401)
Shares repurchased(309) (309) 
Share-based LTIP awards414601161,960
Net increase (decrease) in shareholders' equity from shareholder transactions(7,020)(1,395)(35,624)(18,166)
Net increase (decrease) in shareholders' equity(8,180)14,623(26,998)9,179
SHAREHOLDERS' EQUITY, BEGINNING OF PERIOD384,854294,350403,672299,794
SHAREHOLDERS' EQUITY, END OF PERIOD$ 376,674$ 308,973$ 376,674$ 308,973