Shareholders' Equity - Shareholders Rights Plan (Details)	Jul. 16, 2012 $ / shares
Right To Purchase Series Junior Participating Preferred Shares1
Shareholder Rights Plan
Number of purchase rights issued per Common Share	$ 1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration