Foreign Currency Forward Contracts (Details) In Thousands, unless otherwise specified	0 Months Ended
Feb. 29, 2012 30 Day Forward Contract EURO [Member] EUR (€)	Feb. 29, 2012 30 Day Forward Contract GBP [Member] GBP (£)
Derivatives, Fair Value [Line Items]
Forward Contract Term	30 days	30 days
Derivative, Notional Amount	€ 771	£ 356

Monetary amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant