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Stockholders' Equity - Dividends Declared (Details) - $ / shares		3 Months Ended						9 Months Ended
	Jun. 10, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Dividends declared (in dollars per share)		$ 0.35	$ 0.35	$ 0.40	$ 0.46	$ 0.46	$ 0.46	$ 1.10	$ 1.38
Dividends declared (in dollars per share)		0.50	$ 0.50	$ 0.50	0.50	$ 0.50	$ 0.50
Common Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)		0.35			0.46			1.10	1.38
Series B Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)		$ 0.50			$ 0.50			$ 1.50	1.50
Series C Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)	$ 0.2223								$ 0.7223

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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