Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 27,766	$ (17,633)
Reconciliation of the net increase (decrease) in equity resulting from operations to net cash provided by (used in) operating activities:
Net realized (gain) loss on investments, financial derivatives, and foreign currency transactions	13,018	36,073
Change in net unrealized (gain) loss on investments and financial derivatives, and foreign currency translation	(7,472)	9,706
Amortization of premiums and accretion of discounts (net)	23,010	19,053
Purchase of investments	(1,847,795)	(1,862,704)
Proceeds from disposition of investments	1,378,115	1,795,924
Proceeds from principal payments of investments	214,636	188,378
Proceeds from investments sold short	1,456,930	1,098,986
Repurchase of investments sold short	(1,382,642)	(1,175,609)
Payments on financial derivatives	(76,667)	(315,221)
Proceeds from financial derivatives	79,207	345,997
Amortization of deferred debt issuance costs	30	0
Share-based LTIP expense	285	300
Repurchase agreements	(8,251)	(59,348)
(Increase) decrease in assets:
Receivable for securities sold and financial derivatives	(53,941)	142,286
Due from brokers	(14,522)	15,350
Interest and principal receivable	(3,302)	3,067
Restricted cash	230	(753)
Other assets	190	(24,638)
Increase (decrease) in liabilities:
Due to brokers	(9,167)	(99,197)
Payable for securities purchased and financial derivatives	84,549	63,847
Accounts payable and accrued expenses	515	(730)
Other liabilities	181	(665)
Interest and dividends payable	1,408	1,472
Base management fee payable to affiliate	(255)	(288)
Net cash provided by (used in) operating activities	(123,944)	163,653
Cash flows provided by (used in) financing activities:
Contributions from non-controlling interests	14,201	4,747
Shares repurchased	(4,791)	(8,797)
Dividends paid	(44,336)	(50,256)
Distributions to non-controlling interests	(8,178)	(2,560)
Proceeds from issuance of other secured borrowings	94,878	40,921
Principal payments on other secured borrowings	(21,020)	(10,151)
Proceeds from issuance of senior notes	86,000	0
Debt issuance costs paid	(890)	0
Borrowings under reverse repurchase agreements	8,663,470	4,740,559
Repayments of reverse repurchase agreements	(8,667,241)	(4,882,407)
Net cash provided by (used in) financing activities	112,093	(167,944)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(11,851)	(4,291)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	123,274	183,909
CASH AND CASH EQUIVALENTS, END OF PERIOD	111,423	179,618
Supplemental disclosure of cash flow information:
Interest paid	19,683	10,996
Share-based LTIP awards (non-cash)	285	300
Aggregate TBA trade activity (buys sells) (non-cash)	17,198,330	17,241,758
Purchase of investments (non-cash)	(25,318)	(27,502)
Proceeds from principal payments of investments (non-cash)	6,815	0
Proceeds from the disposition of investments (non-cash)	26,800	80,029
Proceeds from issuance of other secured borrowings (non-cash)	17,175	13,088
Principal payments on other secured borrowings (non-cash)	(25,473)	(13,088)
Payments made to open financial derivatives (non-cash)	0	(4,000)
Repayments of reverse repurchase agreements (non-cash)	$ 0	$ (48,527)