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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Dividends Payable [Line Items]
Declaration Date	Mar. 19, 2018	Dec. 07, 2017	Sep. 14, 2017	Jun. 14, 2017	Mar. 16, 2017
Record Date	Mar. 29, 2018	Dec. 18, 2017	Sep. 25, 2017	Jun. 26, 2017	Mar. 27, 2017
Payment Date	Apr. 26, 2018	Jan. 25, 2018	Oct. 25, 2017	Jul. 25, 2017	Apr. 25, 2017
Series B Preferred Stock
Dividends Payable [Line Items]
Declaration Date	Mar. 19, 2018	Dec. 07, 2017	Sep. 14, 2017	Jun. 14, 2017	Mar. 16, 2017
Record Date	Apr. 01, 2018	Jan. 01, 2018	Oct. 01, 2017	Jul. 01, 2017	Apr. 01, 2017
Payment Date	Apr. 15, 2018	Jan. 15, 2018	Oct. 15, 2017	Jul. 15, 2017	Apr. 15, 2017
Cash Dividend Per Share (in dollars per share)	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375
Series C Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	0.4921875	0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875
Series D Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.50	$ 0.51111

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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