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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ 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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No definition available.

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Income Taxes - Schedule of Common Stock Distribution (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2016
Dividends Payable [Line Items]
Dividends, amount per share	$ 1.48	$ 8.265	$ 2.26
Common dividends, per share (in dollars per share)	1.48	2.095	2.260
Ordinary dividends
Dividends Payable [Line Items]
Dividends, amount per share	1.48	1.5561	2.1184
Capital gain dividends
Dividends Payable [Line Items]
Dividends, amount per share	0	0	0.0316
Nondividend distributions
Dividends Payable [Line Items]
Dividends, amount per share	$ 0	6.7089	$ 0.11
Nondividend distributions \| Spinoff
Dividends Payable [Line Items]
Dividends, amount per share		$ 6.17		$ 6.17