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Stock based Compensation (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Based Compensation [Line Items]      
Stock-based compensation expense $ 25,100,000hcc_StockBasedCompensationExpense $ 16,200,000hcc_StockBasedCompensationExpense $ 13,200,000hcc_StockBasedCompensationExpense
Total tax benefit recognized in earnings from stock-based compensation 8,800,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 5,700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 4,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Unrecognized compensation expense related to unvested options and restricted stock awards 29,300,000hcc_UnrecognizedCompensationExpenseRelatedToUnvestedOptionsAndRestrictedStockAwards    
Total unrecognized compensation cost recognized over a weighted-average period 1.6hcc_TotalUnrecognizedCompensationCostRecognizedOverWeightedAveragePeriod    
Board Of Directors Fully Vested Stock Compensation 110,000hcc_BoardOfDirectorsFullyVestedStockCompensation 80,000hcc_BoardOfDirectorsFullyVestedStockCompensation  
Chairman Of Board Fully Vested Common Stock Compensation 200,000hcc_ChairmanOfBoardFullyVestedCommonStockCompensation    
Aggregate intrinsic value of options exercised 10,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 5,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 10,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Cash receipts from option exercises 11,800,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 10,300,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 60,000,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Fair Value Of Rest Stock Awards Vested 13,000,000hcc_FairValueOfRestStockAwardsVested 14,400,000hcc_FairValueOfRestStockAwardsVested 10,900,000hcc_FairValueOfRestStockAwardsVested
Fair Value Of Rest Stock Units Vested 400,000hcc_FairValueOfRestStockUnitsVested 1,600,000hcc_FairValueOfRestStockUnitsVested 2,600,000hcc_FairValueOfRestStockUnitsVested
Tax benefit (charge) from stock options 3,500,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 2,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 3,700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Employee Stock Purchase Plans Discount Rate 85.00%hcc_EmployeeStockPurchasePlansDiscountRate    
Employee Stock Purchase Plans Base Salary Investment Percentage Minimum 1.00%hcc_EmployeeStockPurchasePlansBaseSalaryInvestmentPercentageMinimum    
Employee Stock Purchase Plans Base Salary Investment Percentage Maximum 15.00%hcc_EmployeeStockPurchasePlansBaseSalaryInvestmentPercentageMaximum    
Employee Stock Purchase Plans Investment Limit Per Period Shares 1,500hcc_EmployeeStockPurchasePlansInvestmentLimitPerPeriodShares    
Employee Stock Purchase Plans Investment Limit Per Calendar Year Fair Value 25,000hcc_EmployeeStockPurchasePlansInvestmentLimitPerCalendarYearFairValue    
Issuance of shares for employee stock purchase plan 92,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 0us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 0us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Board of Directors increase in deferred Stock Compensation paid out $ 323,000hcc_Boardofdirectorsincreaseindeferredstockcompensationpaidout    
Employee Stock Purchase Plan [Member]      
Stock Based Compensation [Line Items]      
Shares authorized for Issuance Under Employee Stock Purchase Plan 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= hcc_EmployeeStockPurchasePlanMember		    
Flexible Incentive Plan 2008 [Member]      
Stock Based Compensation [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= hcc_FlexibleIncentivePlan2008Member		    
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance 2,800,000hcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuance
/ us-gaap_PlanNameAxis
= hcc_FlexibleIncentivePlan2008Member		    
Shares authorized for Issuance Under Employee Stock Purchase Plan 3,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= hcc_FlexibleIncentivePlan2008Member		    
MinimumMember      
Stock Based Compensation [Line Items]      
Percentage Of Restricted Stock Shares Vesting Range 0.00%hcc_PercentageOfRestrictedStockSharesVestingRange
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
MaximumMember      
Stock Based Compensation [Line Items]      
Percentage Of Restricted Stock Shares Vesting Range 200.00%hcc_PercentageOfRestrictedStockSharesVestingRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember