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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- Definition

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	May 03, 2018	Feb. 02, 2018	Oct. 31, 2017	Aug. 02, 2017	May 04, 2017	Feb. 09, 2017
Subsequent Event [Line Items]
Dividends declared date		Feb. 02, 2018	Oct. 31, 2017	Aug. 02, 2017	May 04, 2017	Feb. 09, 2017
Dividend amount to be paid, per common share		$ 0.4050	$ 0.3950	$ 0.3850	$ 0.3750	$ 0.3650
Date dividend is payable		Mar. 09, 2018	Dec. 05, 2017	Sep. 01, 2017	Jun. 02, 2017	Mar. 09, 2017
Date shareholders must be on record for dividend		Feb. 22, 2018	Nov. 17, 2017	Aug. 14, 2017	May 19, 2017	Feb. 22, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared date	May 03, 2018
Dividend amount to be paid, per common share	$ 0.4150
Date dividend is payable	Jun. 01, 2018
Date shareholders must be on record for dividend	May 18, 2018