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

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Subsequent Events (Details) - $ / shares			3 Months Ended		6 Months Ended
Subsequent Events (Details) - $ / shares	Aug. 15, 2018	Jul. 19, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Subsequent events
Dividends declared per common share (in dollars per share)			$ 0.20	$ 0.20	$ 0.40	$ 0.40
Subsequent Event
Subsequent events
Dividends declared per common share (in dollars per share)		$ 0.23
Subsequent Event \| Forecast
Subsequent events
Dividends paid per common share (in dollars per share)	$ 0.23