Stockholders' Equity - Dividends Declared (Details) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 0.40	$ 1.05	$ 1.10
Dividends declared (in dollars per share)		$ 0.50	$ 0.50	0.50		$ 0.50	0.45
Common Stock
Class of Stock [Line Items]
Dividends declared on common stock (in dollars per share)	0.35			0.35			1.05	1.10
Series B Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)	0			0.50			1.00	1.50
Series B-1 Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)	$ 0.45			$ 0			$ 0.45	$ 0