Capital Stock - Preferred Stock (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Dec. 31, 2022 USD ($) shares	Oct. 30, 2021 USD ($) shares
Class of Stock [Line Items]
Dividends on preferred stock	$ 18,438	$ 18,438	$ 55,313	$ 55,283
Tenor spread adjustment	0.0026161		0.0026161
Series A Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 3,000	$ 3,000	$ 9,000	$ 9,000
Preferred stock dividends declared (in dollars per share) | $ / shares	$ 0.50	$ 0.50	$ 1.50	$ 1.50
Preferred stock, shares outstanding (in shares) | shares	5,800,000		5,800,000		5,800,000	5,800,000
Preferred Stock, liquidation preference	$ 145,000		$ 145,000		$ 145,000	$ 145,000
Preferred stock, dividend rate (percent)			8.00%		8.00%
Series B Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 7,000	$ 7,000	$ 20,000	$ 20,000
Preferred stock dividends declared (in dollars per share) | $ / shares	$ 0.50	$ 0.50	$ 1.50	$ 1.50
Preferred stock, shares outstanding (in shares) | shares	13,000,000		13,000,000		13,000,000
Preferred Stock, liquidation preference	$ 325,000		$ 325,000		$ 325,000
Preferred stock, dividend rate (percent)	8.00%		8.00%		8.00%
Series C Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 5,000	$ 5,000	$ 15,000	$ 15,000
Preferred stock dividends declared (in dollars per share) | $ / shares	$ 0.484375	$ 0.484375	$ 1.453125	$ 1.453125
Preferred stock, shares outstanding (in shares) | shares	10,400,000		10,400,000		10,400,000
Preferred Stock, liquidation preference	$ 260,000		$ 260,000		$ 260,000
Preferred stock, dividend rate (percent)	7.75%		7.75%		7.75%
Series D Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 4,000	$ 4,000	$ 12,000	$ 12,000
Preferred stock dividends declared (in dollars per share) | $ / shares	$ 0.50	$ 0.50	$ 1.50	$ 1.50
Preferred stock, shares outstanding (in shares) | shares	8,000,000		8,000,000		8,000,000
Preferred Stock, liquidation preference	$ 200,000		$ 200,000		$ 200,000
Preferred stock, dividend rate (percent)	8.00%		8.00%		8.00%