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														12 Months Ended
Subsequent Events (Details) - $ / shares	Feb. 23, 2017	Nov. 02, 2016	Aug. 04, 2016	May 09, 2016	Feb. 25, 2016	Nov. 05, 2015	Aug. 04, 2015	May 05, 2015	Feb. 25, 2015	Nov. 05, 2014	Aug. 06, 2014	May 06, 2014	Feb. 24, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Events
Dividend declared (in dollars per share)		$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 1.92	$ 1.92	$ 1.92
Subsequent Events
Subsequent Events
Dividend declared (in dollars per share)	$ 0.48