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Stockholders' Equity - Dividends Declared (Details) - $ / shares	2 Months Ended	3 Months Ended			6 Months Ended
	Jun. 10, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Class of Stock [Line Items]
Dividends declared (in dollars per share)		$ 0.46		$ 0.46	$ 0.92	$ 0.92
Common stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)		0.46	$ 0.46
Series B Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)		0.50	0.50
Series C Preferred Stock
Class of Stock [Line Items]
Dividends declared (in dollars per share)	$ 0.2223	$ 0.2223	$ 0.50

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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=27012166&loc=d3e187085-122770

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