Commitments and Contingencies (Details)	3 Months Ended	1 Months Ended
Mar. 31, 2014 item	Feb. 29, 2012 Nishimura case item
Commitments and Contingencies
Number of cases that alleges damages	0
Litigation
Number of lawsuits dismissed		3
Number of lawsuits filed against the entity	4	5

The number of claims settled and dismissed during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Name:	us-gaap_LossContingencyClaimsSettledAndDismissedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration