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Asset Liquidation Investments and Other Investments (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets | $ 3,733 | $ 3,435
Noncurrent assets | 222 | 34
Current liabilities | 337 | 14
Noncurrent liabilities | $ 0 | $ 0

X
- Definition Sum of the carrying amounts as of the balance sheet date of the company's share of all joint venture assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References No definition available. + Details
Name: | crbn_AssetLiquidationAssetsCurrent
Namespace Prefix: | crbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the balance sheet date of the company's share of all joint venture assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. + References No definition available. + Details
Name: | crbn_AssetLiquidationAssetsNoncurrent
Namespace Prefix: | crbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The company's share of joint ventures' total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + References No definition available. + Details
Name: | crbn_AssetLiquidationLiabilitiesCurrent
Namespace Prefix: | crbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The company's share of joint ventures' total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. + References No definition available. + Details
Name: | crbn_AssetLiquidationLiabilitiesNoncurrent
Namespace Prefix: | crbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant