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Senior secured notes, convertible notes, and corporate debt, net (Details)								1 Months Ended		3 Months Ended	9 Months Ended
	Sep. 16, 2022 USD ($)	Oct. 20, 2021 USD ($)	Feb. 10, 2021 USD ($)	Jul. 22, 2019 USD ($)	Apr. 27, 2018 USD ($)	Aug. 09, 2017 USD ($)	Apr. 18, 2017 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Jul. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) item $ / shares shares	Dec. 31, 2021 USD ($)	May 20, 2021 USD ($)	Dec. 02, 2019 USD ($)	Jan. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 16, 2005 USD ($)	Mar. 15, 2005 USD ($)
Senior secured notes, Convertible notes, and Corporate debt
Total Senior secured notes, net								$ 342,912,000		$ 342,912,000	$ 342,912,000	$ 342,035,000
Total Corporate debt, net								662,247,000		662,247,000	662,247,000	441,817,000
Total Convertible notes, net								114,108,000		114,108,000	114,108,000	$ 113,247,000
Total carrying amount of debt components								1,119,267,000		1,119,267,000	1,119,267,000
Total carrying amount of conversion option of equity components recorded in equity								308,000		308,000	308,000
Debt notes available for sale under At Market Issuance Sales Agreement													$ 100,000,000.0
Contractual maturities of the Senior Secured Notes, Convertible Notes, and Corporate debt
2023								115,000,000		115,000,000	115,000,000
2025								120,000,000		120,000,000	120,000,000
2026								660,883,000		660,883,000	660,883,000
Thereafter								246,249,000		246,249,000	246,249,000
Total contractual amounts								1,142,132,000		1,142,132,000	1,142,132,000
Unamortized deferred financing costs, discounts, and premiums, net								(22,865,000)		(22,865,000)	(22,865,000)
Total carrying amount of debt components								1,119,267,000		1,119,267,000	1,119,267,000
7.50% Senior Secured Notes Due 2022
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value								$ 100,000,000		$ 100,000,000	$ 100,000,000
Interest rate (as a percent)		7.50%						7.375%		7.375%	7.375%					7.50%
Convertible Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value						$ 115,000,000.0		$ 115,000,000		$ 115,000,000	$ 115,000,000
Interest rate (as a percent)						7.00%		7.00%		7.00%	7.00%
Conversion ratio								1.6452
Principal amount of notes for conversion								$ 25		$ 25	$ 25
Initial conversion price \| $ / shares								$ 15.20		$ 15.20	$ 15.20
Principal amount of the notes to be redeemed (as a percent)						100.00%
Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature \| item											30
Threshold period of specified consecutive trading days within which the common stock price, used in a calculation with with the conversion rate, the result of which must exceed the threshold percentage											5 days
Specified period of time used to calculate average closing market price of common stock to be used as a factor in determining potential trigger of conversion feature											10 days
Gross carrying value of convertible notes						$ 112,700,000
Gross carrying value of the equity component						$ 2,300,000
Unamortized discount								$ (308,000)		$ (308,000)	$ (308,000)
Unamortized deferred financing costs								(584,000)		(584,000)	(584,000)
Total Convertible notes, net								114,108,000		114,108,000	$ 114,108,000
Convertible Notes \| Minimum
Senior secured notes, Convertible notes, and Corporate debt
Percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion											120.00%
Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature \| item											20
The threshold percentage that per share value of distributions exceeds the average market price which may trigger the conversion feature											10.00%
Convertible Notes \| Maximum
Senior secured notes, Convertible notes, and Corporate debt
Threshold percentage of the trading price of the convertible debt instrument to the product of the conversion rate and the closing stock price during any five consecutive trading day period											98.00%
Corporate Debt
Senior secured notes, Convertible notes, and Corporate debt
Unamortized discount								(10,389,000)		(10,389,000)	$ (10,389,000)
Unamortized deferred financing costs								(4,497,000)		(4,497,000)	(4,497,000)
Total Corporate debt, net								$ 662,247,000		$ 662,247,000	$ 662,247,000
7.375% Senior Notes due in 2027
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value	$ 20,000,000.0								$ 80,000,000.0
Interest rate (as a percent)	7.375%							7.375%	7.375%	7.375%	7.375%
Proceeds from issuance of unsecured debt	$ 19,300,000								$ 77,500,000
Repurchase price percentage in the event of change of control											1.01%
7.375% Senior Notes due in 2027 \| Prior to July 31, 2025
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											100.00%
7.375% Senior Notes due in 2027 \| On or after July 31, 2025 and prior to July 31, 2026
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											103.688%
7.375% Senior Notes due in 2027 \| On or after July 31, 2026 and prior to the maturity date
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											100.00%
7.375% Senior Notes due in 2027 \| Notes Treasury Rate
Senior secured notes, Convertible notes, and Corporate debt
Pricing, spread on variable (as a percent)											0.50%
6.20% and 5.75% Senior Notes due 2026
Senior secured notes, Convertible notes, and Corporate debt
Proceeds from issuance of unsecured debt											$ 5,300,000
Debt issuance related expenses											$ 100,000
Number of shares sold in At The Market debt offering \| shares										0	215,300
6.20% Senior Notes due 2026
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value				$ 57,500,000				$ 104,613,000		$ 104,613,000	$ 104,613,000			$ 45,000,000.0
Interest rate (as a percent)				6.20%				6.20%		6.20%	6.20%		6.20%	6.20%
Proceeds from issuance of unsecured debt				$ 55,300,000
Debt notes price per share \| $ / shares											$ 25.40
6.20% Senior Notes due 2026 \| 2025
Senior secured notes, Convertible notes, and Corporate debt
Principal amount of the notes to be redeemed (as a percent)				101.00%
6.20% Senior Notes due 2026 \| 2026
Senior secured notes, Convertible notes, and Corporate debt
Principal amount of the notes to be redeemed (as a percent)				100.00%
Repurchase price percentage in the event of change of control				101.00%
6.20% Senior Notes due 2026 \| Over-allotment option
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value				$ 7,500,000
5.75% Senior Notes Due 2026
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value			$ 201,300,000					$ 206,270,000		$ 206,270,000	$ 206,270,000
Interest rate (as a percent)			5.75%					5.75%		5.75%	5.75%		5.75%
Proceeds from issuance of unsecured debt			$ 195,200,000
Debt redemption price percentage			100.00%
Repurchase price percentage in the event of change of control			101.00%
Debt notes price per share \| $ / shares											$ 25.05
5.75% Senior Notes Due 2026 \| Over-allotment option
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value			$ 26,300,000
6.50% Senior Notes due 2021
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value					$ 50,000,000.0
Interest rate (as a percent)					6.50%
6.50% Senior Notes due 2021 \| 2024
Senior secured notes, Convertible notes, and Corporate debt
Principal amount of the notes to be redeemed (as a percent)					100.00%
6.125% Senior Notes due 2025
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value							$ 120,000,000.0	$ 120,000,000		$ 120,000,000	$ 120,000,000
Interest rate (as a percent)							6.125%	6.125%		6.125%	6.125%
Proceeds from issuance of unsecured debt							$ 116,800,000
Debt redemption price percentage							100.00%
Repurchase price percentage in the event of change of control							101.00%
4.50% Senior Secured Notes Due 2026
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value		$ 350,000,000.0						$ 350,000,000		$ 350,000,000	$ 350,000,000
Interest rate (as a percent)		4.50%						4.50%		4.50%	4.50%
Proceeds from issuance of secured debt		$ 341,800,000
Unamortized deferred financing costs								$ (7,088,000)		$ (7,088,000)	$ (7,088,000)
Total Senior secured notes, net								342,912,000		342,912,000	$ 342,912,000
Proceeds from note offerings		$ 341,800,000
4.50% Senior Secured Notes Due 2026 \| Prior to October 20, 2023
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											100.00%
4.50% Senior Secured Notes Due 2026 \| On or after October 20, 2023 and prior to October 20, 2024
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											102.25%
4.50% Senior Secured Notes Due 2026 \| On or after October 20, 2024 and prior to October 20, 2025
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											101.125%
4.50% Senior Secured Notes Due 2026 \| On or after October 20, 2025 and prior to maturity date
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage											100.00%
Junior Subordinated Notes \| Three Month LIBOR
Senior secured notes, Convertible notes, and Corporate debt
Pricing, spread on variable (as a percent)											3.10%
Junior Subordinated I-A Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value								15,000,000		15,000,000	$ 15,000,000
Junior Subordinated I-B Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value								21,250,000		21,250,000	21,250,000
5.50% Senior Notes due 2028
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value			$ 110,000,000.0					$ 110,000,000		$ 110,000,000	$ 110,000,000
Interest rate (as a percent)			5.50%					5.50%		5.50%	5.50%
Proceeds from issuance of unsecured debt			$ 107,400,000
Repurchase price percentage in the event of change of control			101.00%
5.50% Senior Notes due 2028 \| 2024
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage			102.75%
5.50% Senior Notes due 2028 \| 2025
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage			101.375%
5.50% Senior Notes due 2028 \| 2026
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage			100.6875%
5.50% Senior Notes due 2028 \| 2027 and thereafter
Senior secured notes, Convertible notes, and Corporate debt
Debt redemption price percentage			100.00%
ReadyCap Holdings LLC \| 7.50% Senior Secured Notes Due 2022
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value															$ 40,000,000.0	$ 140,000,000.0
Interest rate (as a percent)															7.50%	7.50%
Yield-to-maturity (as a percent)															6.50%
ANH \| Junior Subordinated Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value																		$ 37,380,000
Anworth Capital Trust I
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value																		36,250,000
Anworth Capital Trust I \| Junior Subordinated Notes \| Three Month LIBOR
Senior secured notes, Convertible notes, and Corporate debt
Pricing, spread on variable (as a percent)											3.10%
Anworth Capital Trust I \| Junior Subordinated I-A Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value																		$ 15,000,000
Anworth Capital Trust I \| Junior Subordinated I-B Notes
Senior secured notes, Convertible notes, and Corporate debt
Debt instrument, face value																	$ 21,250,000