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

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

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares						3 Months Ended
	Jul. 15, 2017	Apr. 15, 2017	Jan. 15, 2017	Oct. 15, 2016	Jul. 15, 2016	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Dividends Payable [Line Items]
Declaration Date						Jun. 14, 2017	Mar. 16, 2017	Dec. 15, 2016	Sep. 15, 2016	Jun. 16, 2016	Mar. 18, 2016
Record Date						Jun. 26, 2017	Mar. 27, 2017	Dec. 27, 2016	Sep. 26, 2016	Jun. 27, 2016	Mar. 28, 2016
Payment Date						Jul. 25, 2017	Apr. 25, 2017	Jan. 26, 2017	Oct. 28, 2016	Jul. 25, 2016	Apr. 25, 2016
Series B Preferred Stock
Dividends Payable [Line Items]
Declaration Date						Jun. 14, 2017	Mar. 16, 2017	Dec. 15, 2016	Sep. 15, 2016	Jun. 16, 2016	Mar. 18, 2016
Record Date						Jul. 01, 2017	Apr. 01, 2017	Jan. 01, 2017	Oct. 01, 2016	Jul. 01, 2016	Apr. 01, 2016
Payment Date						Jul. 15, 2017	Apr. 15, 2017	Jan. 15, 2017	Oct. 15, 2016	Jul. 15, 2016	Apr. 15, 2016
Cash Dividend Per Share (in dollars per share)		$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375
Series C Preferred Stock
Dividends Payable [Line Items]
Declaration Date						Jun. 14, 2017	Mar. 16, 2017	Dec. 15, 2016	Sep. 15, 2016	Jun. 16, 2016	Mar. 18, 2016
Record Date						Jul. 01, 2017	Apr. 01, 2017	Jan. 01, 2017	Oct. 01, 2016	Jul. 01, 2016	Apr. 01, 2016
Payment Date						Jul. 15, 2017	Apr. 15, 2017	Jan. 15, 2017	Oct. 15, 2016	Jul. 15, 2016	Apr. 15, 2016
Cash Dividend Per Share (in dollars per share)		$ 0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875
Subsequent Event \| Series B Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.484375
Subsequent Event \| Series C Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.4921875