Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 79,362		$ 97,146		$ 10,327
Reconciliation of the net increase in equity resulting from operations to net cash provided by (used in) operating activities:
Change in net unrealized (gain) loss on investments and financial derivatives	(11,663)		(84,206)		61,199
Net realized (gain) loss on investments, financial derivatives, and foreign currency transactions	(18,002)		11,247		(26,831)
Amortization of premiums and accretion of discounts (net)	(18,619)		(13,010)		(9,012)
Purchase of investments	(2,224,370)		(2,345,880)		(3,510,693)
Proceeds from disposition of investments	1,713,538		2,166,238		3,456,869
Proceeds from principal payments of investments	190,720		142,617		105,974
Proceeds from investments sold short	947,556		938,699		903,545
Repurchase of investments sold short	(702,846)		(796,974)		(1,254,648)
Payments made to open financial derivatives	(25,624)		(91,019)		(150,437)
Proceeds received to close financial derivatives	42,643		126,207		255,346
Proceeds received to open financial derivatives	39,822		42,920		27,209
Payments made to close financial derivatives	(46,419)		(56,948)		(33,213)
Shares issued in connection with incentive fee payment	1,262		1,180		203
Share-based LTIP expense	179		135		147
(Increase) decrease in assets:
(Increase) decrease in repurchase agreements	(14,312)		2,100		9,934
(Increase) decrease in receivable for securities sold	(256,086)		(93,211)		265,434
(Increase) decrease in due from brokers	(59,827)		11,419		(13,769)
(Increase) decrease in interest and principal receivable	(1,112)		408		(218)
Increase in other assets	(1,095)		(111)		0
Increase (decrease) in liabilities:
Decrease in due to brokers	(11,192)		(48,781)		(86,674)
Increase (decrease) in payable for securities purchased	135,714		(70,184)		(56,496)
Increase (decrease) in accounts payable and accrued expenses	(75)		98		(239)
Increase (decrease) in incentive fee payable	(4,252)		7,343		(1,422)
Increase in other payables	(903)		903		0
Increase (decrease) in interest and dividends payable	789		(270)		141
Increase (decrease) in base management fee payable	430		538		(129)
Net cash used in operating activities	(244,382)		(51,396)		(47,453)
Cash flows provided by (used in) financing activities:
Net proceeds from the issuance of shares	125,600	[1]	88,142	[1]	0	[1]
Contribution from non-controlling interest	5,880		0		0
Shares repurchased	0		(3,430)		(1,051)
Offering costs paid	(444)		(323)		(618)
Dividends paid	(92,067)		(47,412)		(42,382)
Distributions to non-controlling Interest	(260)		0		0
Proceeds from issuance of securitized debt	0		1,522		0
Principal payments on securitized debt	(370)		(264)		0
Reverse repurchase agreements, net of repayments	330,448		9,508		118,450
Net cash provided by financing activities	368,787		47,743		74,399
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	124,405		(3,653)		26,946
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	59,084		62,737		35,791
CASH AND CASH EQUIVALENTS, END OF PERIOD	183,489		59,084		62,737
Supplemental disclosure of cash flow information:
Interest paid	10,389		8,040		6,600
Shares issued in connection with incentive fee payment (non-cash)	1,262		1,180		203
Share-based LTIP awards (non-cash)	179		135		147
Aggregate TBA trade activity (buys sells) (non-cash)	$ 24,946,079		$ 16,365,027		$ 21,558,273

[1] Proceeds from the issuance of shares are net of underwriters' discount in the amount of $1,852 for the year ended December 31, 2012.