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

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

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Subsequent Events (Details) - $ / shares	Feb. 02, 2018	Oct. 31, 2017	Aug. 02, 2017	May 04, 2017	Feb. 09, 2017	Nov. 01, 2016	Aug. 02, 2016	May 05, 2016	Feb. 10, 2016
Subsequent Event [Line Items]
Dividends declared date		Oct. 31, 2017	Aug. 02, 2017	May 04, 2017	Feb. 09, 2017	Nov. 01, 2016	Aug. 02, 2016	May 05, 2016	Feb. 10, 2016
Dividend amount to be paid, per common share (in dollars per share)		$ 0.3950	$ 0.3850	$ 0.3750	$ 0.3650	$ 0.3550	$ 0.3450	$ 0.3350	$ 0.3250
Date dividend is payable		Dec. 05, 2017	Sep. 01, 2017	Jun. 02, 2017	Mar. 09, 2017	Dec. 05, 2016	Sep. 01, 2016	Jun. 02, 2016	Mar. 10, 2016
Date shareholders must be on record for dividend		Nov. 17, 2017	Aug. 14, 2017	May 19, 2017	Feb. 22, 2017	Nov. 18, 2016	Aug. 17, 2016	May 18, 2016	Feb. 23, 2016
Subsequent Event
Subsequent Event [Line Items]
Dividends declared date	Feb. 02, 2018
Dividend amount to be paid, per common share (in dollars per share)	$ 0.4050
Date dividend is payable	Mar. 09, 2018
Date shareholders must be on record for dividend	Feb. 22, 2018