SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012 M
Cash and Cash Equivalents
Maximum maturities of highly liquid investments to be considered as cash equivalents (in months)	3
Restricted Cash
Restricted cash to eliminate letters of credit obligations	$ 3.1

Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

No definition available.

Name:	us-gaap_RestrictedCashAndInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant