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

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Subsequent Events (Details) - $ / shares									3 Months Ended		9 Months Ended
Subsequent Events (Details) - $ / shares	Nov. 02, 2017	Aug. 02, 2017	May 05, 2017	Mar. 21, 2017	Nov. 02, 2016	Aug. 03, 2016	May 02, 2016	Feb. 22, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash Dividend
Cash dividend declared (in dollars per share)	$ 0.060	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.17	$ 0.17
Subsequent Events
Cash Dividend
Cash dividend declared (in dollars per share)	$ 0.06