Summary of Significant Accounting Policies (Narrative) (Details) (Arkose [Member])	9 Months Ended
Sep. 30, 2012
Arkose [Member]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	81.00%

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

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