Stockholders' Equity - Dividends Declared (Details) - $ / shares		3 Months Ended								12 Months Ended
	Jun. 10, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Dividends declared (in dollars per share)		$ 0.35	$ 0.35	$ 0.35	$ 0.40	$ 0.46	$ 0.46	$ 0.46	$ 0.46	$ 1.45	$ 1.84	$ 1.84
Dividends declared (in dollars per share)										2.00	2.72	4.00
Common stock dividends distribution (in dollar per share)						$ 0.35
Common Stock(1)
Class of Stock [Line Items]
Dividends declared (in dollars per share)										1.45	1.84	1.84
Series B Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)										$ 2.00	2.00	2.00
Series C Preferred Stock(2)
Class of Stock [Line Items]
Dividends declared (in dollars per share)	$ 0.2223										$ 0.7223	$ 2.00