CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 2,309,020	$ 822,245
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of premiums and discounts of investments, net	474,449	668,195
Amortization of securitized debt premiums and discounts and deferred financing costs	991	618
Depreciation, amortization and other noncash expenses	63,839	21,686
Net (gains) losses on disposals of investments	376,943	11,833
Net (gains) losses on investments and derivatives	(1,679,921)	(141,006)
Income from unconsolidated joint ventures	6,441	2,223
Payments on purchases of loans held for sale	(191,641)	(230,503)
Proceeds from sales and repayments of loans held for sale	64,460	330,285
Net receipts (payments) on derivatives	1,519,228	(732,998)
Net change in:
Other assets	100,010	(30,387)
Interest receivable	(8,468)	(17,322)
Interest payable	124,316	68,598
Other liabilities	(136,510)	(43,936)
Net cash provided by (used in) operating activities	3,023,157	729,531
Cash flows from investing activities:
Payments on purchases of Residential Securities	(17,053,068)	(25,852,497)
Proceeds from sales of Residential Securities	9,558,735	11,598,472
Principal payments on Residential Securities	8,696,239	8,971,444
Payments on purchases of MSRs	(381)	(11,081)
Payments on purchases of corporate debt	(744,071)	(374,358)
Principal payments on corporate debt	235,423	295,380
Originations and purchases of commercial real estate related assets	(697,753)	(388,951)
Proceeds from sales of commercial real estate related assets	134,538	11,960
Principal repayments on commercial real estate related assets	478,726	852,381
Proceeds from reverse repurchase agreements	70,016,988	50,280,000
Payments on reverse repurchase agreements	(70,313,441)	(50,280,000)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	5,434	6,160
Payments on purchases of residential mortgage loans held for investment	(729,917)	(668,977)
Proceeds from repayments of residential mortgage loans held for investment	251,407	131,052
Payments on purchases of equity securities	0	(2,104)
Cash paid related to asset acquisition, net of cash acquired	(258,334)	0
Net payment from disposal of subsidiary	0	5,337
Net cash provided by (used in) investing activities	(419,475)	(5,425,782)
Cash flows from financing activities:
Proceeds from repurchase agreements and other secured financing	3,866,183,872	2,505,995,751
Principal payments on repurchase agreements and other secured financing	(3,868,097,943)	(2,501,952,817)
Proceeds from issuance of securitized debt	588,111	0
Principal repayments on securitized debt	(614,536)	(334,386)
Payment of deferred financing cost	0	(2,054)
Net proceeds from stock offerings, direct purchases and dividend reinvestments	1,531,690	1,503,013
Redemption of preferred stock	(412,500)	(185,312)
Principal payments on participation sold	0	(12,827)
Principal payments on mortgages payable	(49)	(54)
Net contributions (distributions) from (to) noncontrolling interests	(780)	(895)
Dividends paid	(1,405,389)	(986,074)
Net cash provided by (used in) financing activities	(2,227,524)	4,024,345
Net (decrease) increase in cash and cash equivalents	376,158	(671,906)
Cash and cash equivalents including cash pledged as collateral, beginning of period	706,589	1,539,746
Cash and cash equivalents including cash pledged as collateral, end of period	1,082,747	867,840
Supplemental disclosure of cash flow information:
Interest received	2,846,535	2,460,097
Dividends received	5,448	3,774
Interest paid (excluding interest paid on interest rate swaps)	1,159,384	693,983
Net interest paid (received) on interest rate swaps	(243,946)	264,965
Taxes paid	86	2,612
Noncash investing activities:
Receivable for unsettled trades	1,266,840	340,033
Payable for unsettled trades	2,505,428	5,243,868
Net change in unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment	(2,696,936)	445,744
Noncash financing activities:
Dividends declared, not yet paid	$ 102,811	$ 326,425