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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Tax on earnings (loss) of other equity accounted investments | $ 0 | $ 0

X
- Definition Tax on Income (Loss) from Equity Method Investments Excluding Asset Liquidation Investments. + References No definition available. + Details
Name: | crbn_TaxOnIncomeLossFromEquityMethodInvestmentsExcludingAssetLiquidationInvestments
Namespace Prefix: | crbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration