Basis Of Presentation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
Jul. 02, 2012	Jun. 30, 2012
Basis Of Presentation [Abstract]
Number of mining complexes operated		18
Company's membership interest percentage in joint venture		99.00%
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 17.5

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 22

-Article 12

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration