CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income (loss)	$ 34,471	$ (181,949)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Amortization of investment premiums	43,298	36,079
Amortization of equity-based awards	1,285	1,767
Amortization of unrealized loss (net) on de-designated hedges	1,237	19
Loss on sale of mortgage investments		67,820
(Gain) loss on derivative instruments (net)	(4,514)	155,835
Other depreciation and amortization	66	59
Net change in receivables, other assets, accounts payable and accrued expenses	3,971	1,479
Net cash provided by operating activities	79,814	81,109
Investing activities:
Purchases of residential mortgage investments	(1,411,055)	(1,453,161)
Proceeds from sales of residential mortgage investments		2,558,871
Interest receivable acquired with the purchase of residential mortgage investments	(1,815)	(2,519)
Principal collections on residential mortgage investments, including changes in mortgage securities principal remittance receivable	1,830,673	1,753,877
Net cash provided by investing activities	417,803	2,857,068
Financing activities:
Proceeds from repurchase arrangements and similar borrowings	31,565,784	47,502,427
Principal payments on repurchase arrangements and similar borrowings	(32,074,984)	(50,202,545)
Increase in cash collateral receivable from derivative counterparties	(3,750)	(38,141)
Net receipts from (payments on) derivative settlements	4,461	(157,773)
Issuance of common stock		12,882
Other capital stock transactions	(104)	(108)
Dividends paid	(38,812)	(38,325)
Net cash used in financing activities	(547,405)	(2,921,583)
Net change in cash and cash equivalents	(49,788)	16,594
Cash and cash equivalents at beginning of period	257,180	105,397
Cash and cash equivalents at end of period	$ 207,392	$ 121,991