SUBSEQUENT EVENTS (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Feb. 28, 2013
Subsequent Event [Line Items]
Repayment period of debt	5 years
Estimated principal amount of the lease	$ 30
Ownership percentage in PSMC (in hundredths)	75.11%
Minimum [Member]
Subsequent Event [Line Items]
Estimated costs of tender offer to noncontrolling interests	25.0
Maximum [Member]
Subsequent Event [Line Items]
Estimated costs of tender offer to noncontrolling interests	$ 30.0

The cash outflow to reacquire other equity not otherwise defined in the taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 20

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Name:	us-gaap_PaymentsForRepurchaseOfOtherEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration