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Income Taxes (Effective Income Tax Expense (Benefit) Rate) (Details)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Income Tax [Line Items] | |||
| Federal statutory tax expense (benefit) rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
| State tax expense (benefit), net of federal benefit | 1.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (69.80%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |
| Depletion in excess of basis | (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | (14.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion |
| Effective Income Tax Rate Reconciliation, Tax Settlements, Domestic | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic | (4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic |
| Valuation allowances | (35.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 89.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (30.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Effective Income Tax Rate Reconciliation Change in Deferred Tax Assets, Valuation Allowance Due to Foreign Taxes | 0.00%cpn_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceDueToForeignTaxes | (19.80%)cpn_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceDueToForeignTaxes | (8.20%)cpn_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceDueToForeignTaxes |
| Foreign taxes | 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (10.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |
| Intraperiod allocation | 0.00%cpn_EffectiveIncomeTaxRateReconciliationIntraperiodAllocation | 4.50%cpn_EffectiveIncomeTaxRateReconciliationIntraperiodAllocation | 4.60%cpn_EffectiveIncomeTaxRateReconciliationIntraperiodAllocation |
| Change in unrecognized tax benefits | (0.40%)cpn_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits | (30.10%)cpn_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits | 5.10%cpn_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits |
| Effective Income Tax Rate Reconciliation Nondeductible Expense Disallowed Compensation | 0.10%cpn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDisallowedCompensation | 11.70%cpn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDisallowedCompensation | 0.40%cpn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDisallowedCompensation |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 8.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther |
| Permanent differences and other items | 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 4.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |
| Effective income tax expense (benefit) rate | 2.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 12.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 8.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations |
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- Definition
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance Due to Foreign Taxes No definition available.
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- Definition
Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits No definition available.
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- Definition
Effective Income Tax Rate Reconciliation Intraperiod Allocation No definition available.
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- Definition
Effective Income Tax Rate Reconciliation Nondeductible Expense Disallowed Compensation No definition available.
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- Details
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| X | ||||||||||
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- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to depletion. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to domestic income tax settlement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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