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Consolidated Statement Of Changes In Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CHANGE IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS    
Net investment income $ 10,960 $ 10,598
Net realized gain (loss) on investments and financial derivatives (11,789) 11,604
Change in net unrealized gain (loss) on investments and financial derivatives 32,884 (11,095)
Net increase in shareholders' equity resulting from operations 32,055 11,107
CHANGE IN SHAREHOLDERS' EQUITY RESULTING FROM SHAREHOLDER TRANSACTIONS    
Shares issued in connection with incentive fee payment   142
Dividends paid (6,735) [1] (22,126) [1]
Share-based LTIP awards 28 38
Net decrease in shareholders' equity from shareholder transactions (6,707) (21,946)
Net increase (decrease) in shareholders' equity 25,348 (10,839)
SHAREHOLDERS' EQUITY, BEGINNING OF PERIOD 370,916 403,672
SHAREHOLDERS' EQUITY, END OF PERIOD $ 396,264 $ 392,833
[1] For the three month periods ending March 31, 2012 and 2011, dividends totaling $0.40 and $1.31, respectively, per common share and LTIP unit outstanding were declared and paid.