Consolidated Statement of Cash Flows (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS	$ 9,785,590	$ 11,326,588
Reconciliation of the net increase (decrease) in shareholders' equity resulting from operations to net cash provided by (used in) operating activities:
Change in net unrealized (gain) loss on investments and financial derivatives	20,574,111	20,741,646
Net realized (gain) loss on investments and financial derivatives	(7,687,766)	(17,928,195)
Amortization of premiums and accretion of discounts (net)	(5,249,519)	(3,197,557)
Purchase of investments	(1,611,306,332)	(1,197,262,915)
Proceeds from disposition of investments	1,611,907,045	1,032,332,961
Proceeds from principal payments of investments	51,972,572	66,373,369
Proceeds from investments sold short	939,340,941	721,847,421
Repurchase of investments sold short	(1,193,782,745)	(519,186,218)
Payments made to open financial derivatives	(94,317,675)	(167,814,104)
Proceeds received to close financial derivatives	170,997,519	130,603,829
Proceeds received to open financial derivatives	13,087,106	39,865,010
Payments made to close financial derivatives	(20,735,291)	(29,218,557)
Shares issued in connection with incentive fee payment	203,369	275,689
Share-based LTIP expense	75,435	1,500,200
(Increase) decrease in assets:
(Increase) decrease in repurchase agreements	3,246,250
(Increase) decrease in receivable for securities sold	245,578,409	(271,452,941)
(Increase) decrease in deposits with dealers held as collateral	(3,050)	(7,172,282)
(Increase) decrease in interest and principal receivable	(1,408,928)	4,927,232
(Increase) decrease in other assets	(333,255)	(534,005)
Increase (decrease) in liabilities:
Increase (decrease) in due to brokers - margin accounts	(49,903,794)	13,257,911
Increase (decrease) in payable for securities purchased	(66,079,890)	329,572,335
Increase (decrease) in accounts payable and accrued expenses	348,429	963,979
Increase (decrease) in incentive fee payable	(1,421,500)	(2,274,530)
Increase (decrease) in interest and dividends payable	16,194	(100,676)
Increase (decrease) in base management fee payable	(76,184)	(29,053)
Net cash provided by (used in) operating activities	14,827,041	157,417,137
Cash flows provided by (used in) financing activities:
Offering costs paid	(438,762)	(594,362)
Dividends paid	(28,882,514)	(18,546,036)
Reverse repurchase agreements, net of repayments	24,140,740	(131,808,301)
Net cash provided by (used in) financing activities	(5,180,536)	(150,948,699)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	9,646,505	6,468,438
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	35,790,818	102,863,164
CASH AND CASH EQUIVALENTS, END OF PERIOD	45,437,323	109,331,602
Supplemental disclosure of cash flow information:
Interest paid	3,129,671	1,698,889
Shares issued in connection with incentive fee payment (non-cash)	203,369	275,689
Share-based LTIP awards (non-cash)	75,435	1,500,200
Aggregate TBA trade activity (buys + sells) (non-cash)	$ 11,055,413,893	$ 6,089,897,901

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