Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net (loss) income	$ (15,987)	$ 24,133
Adjustments to reconcile net income to cash provided by operating activities:
Decrease in accrued interest receivable	241	717
Decrease in accrued interest payable	(409)	(1,056)
Loss on derivative instruments, net	60,982	31,654
Loss (gain) on sale of investments, net	70	(5,273)
Fair value adjustments, net	(75)	(162)
Amortization of investment premiums, net	114,398	104,293
Other amortization and depreciation	4,143	7,007
Stock-based compensation expense	2,220	2,045
Other operating activities	(3,036)	(3,708)
Net cash and cash equivalents provided by operating activities	162,547	159,650
Investing activities:
Purchase of investments	(1,066,461)	(457,008)
Principal payments received on investments	384,063	404,464
Proceeds from sales of investments	339,332	376,278
Principal payments received on mortgage loans held for investment, net	12,241	14,150
Payment to acquire interest in limited partnership	(6,000)	0
Net payments on derivatives, including terminations	(37,502)	(9,086)
Other investing activities	(134)	(8)
Net cash and cash equivalents (used in) provided by investing activities	(374,461)	328,790
Financing activities:
Borrowings under (repayments of) repurchase agreements and FHLB advances, net	296,959	(430,743)
Principal payments on non-recourse collateralized financing	(2,249)	(1,753)
Increase in restricted cash	(35,916)	(19,370)
Proceeds from issuance of common stock, net of issuance costs	101	144
Cash paid for repurchases of common stock	(31,051)	0
Payments related to tax withholding for share-based compensation	(556)	(507)
Dividends paid	(46,682)	(48,902)
Net cash and cash equivalents provided by (used in) financing activities	180,606	(501,131)
Net decrease in cash and cash equivalents	(31,308)	(12,691)
Cash and cash equivalents at beginning of period	43,944	69,330
Cash and cash equivalents at end of period	12,636	56,639
Supplemental Disclosure of Cash Activities:
Cash paid for interest	$ 14,366	$ 15,703