FINANCIAL INSTRUMENTS AND CONCENTRATIONS (Details 2) (Senior revolving loan, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Senior revolving loan
Carrying value of amount outstanding
Amount outstanding under credit facility which approximated fair value	$ 199.0	$ 217.0

Amount borrowed under the credit facility as of the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant