Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Oct. 24, 2016	Sep. 23, 2016	Sep. 22, 2016	Aug. 01, 2016	Jul. 31, 2016	Feb. 22, 2016	Feb. 21, 2016	Dec. 31, 2015	Sep. 18, 2015	Sep. 17, 2015	Mar. 31, 2015
Equity
Share capital, par value (in dollars per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.01		$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Share capital, shares outstanding (in shares)	105,965,192				105,945,238	529,728,928			34,535,128			22,246,336.000