PATTIKI VERTICAL HOIST CONVEYOR SYSTEM FAILURE IN 2010 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2010
PATTIKI VERTICAL HOIST CONVEYOR SYSTEM FAILURE IN 2010
Expenses related to certain retirement of assets	$ (1,204)

Amount of gain (loss) from the disposal of an asset through means other than sale, for example, but not limited to, abandonment, spin-off, and expropriation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6390744&loc=d3e2212-110226

Name:	us-gaap_AssetsDisposedOfByMethodOtherThanSaleInPeriodOfDispositionGainLossOnDisposition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration