Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 22,838	$ 40,746
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	2,624	(17,585)
Net realized (gain) loss on investments, financial derivatives, and foreign currency transactions	(11,189)	(12,592)
Amortization of premiums and accretion of discounts (net)	(3,553)	(4,596)
Purchase of investments	(712,690)	(448,079)
Proceeds from disposition of investments	681,516	280,923
Proceeds from principal payments of investments	32,581	46,326
Proceeds from investments sold short	824,365	662,132
Repurchase of investments sold short	(865,138)	(633,283)
Payments made to open financial derivatives	(10,416)	(732)
Proceeds received to close financial derivatives	15,413	10,766
Proceeds received to open financial derivatives	6,309	5,165
Payments made to close financial derivatives	(25,711)	(6,327)
Shares issued in connection with incentive fee payment	309	734
Share-based LTIP expense	63	42
(Increase) decrease in assets:
Increase in repurchase agreements	(1,913)	(28,964)
Decrease in receivable for securities sold	50,164	17,680
Decrease in due from brokers	13,708	767
Decrease in interest and principal receivable	31	212
Increase in other assets	(147)	(29)
Increase (decrease) in liabilities:
Increase (decrease) in due to brokers	11,098	(9,355)
Increase in payable for securities purchased	38,762	75,417
Increase (decrease) in accounts payable and accrued expenses	471	(64)
Decrease in incentive fee payable	(3,091)	(5,288)
Increase (decrease) in other payables	0	(903)
Increase (decrease) in interest and dividends payable	(65)	317
Increase (decrease) in base management fee payable	0	33
Net cash provided by (used in) operating activities	66,339	(26,537)
Cash flows provided by (used in) financing activities:
Contribution from non-controlling interest	1,001	4,664
Offering costs paid	0	(3)
Dividends paid	(20,070)	(31,939)
Distributions to non-controlling Interest	(114)	0
Principal payments on securitized debt	(24)	(70)
Reverse repurchase agreements, net of repayments	(60,259)	59,554
Net cash provided by (used in) financing activities	(79,466)	32,206
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(13,127)	5,669
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	183,489	59,084
CASH AND CASH EQUIVALENTS, END OF PERIOD	170,362	64,753
Supplemental disclosure of cash flow information:
Interest paid	2,693	1,826
Shares issued in connection with incentive fee payment (non-cash)	309	734
Share-based LTIP awards (non-cash)	63	42
Aggregate TBA trade activity (buys sells) (non-cash)	$ 6,215,156	$ 4,092,595