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INCOME TAXES (Sources and Tax Effects of Differences Between Benefit from Income Taxes and Amount Computed by Applying Federal Statutory Income Tax Rate to Losses from Continuing Operations before Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INCOME TAXES [Abstract]      
Income tax benefit at the federal statutory tax rate of 35% $ 104,594us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (1,296)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (42,146)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Statutory depletion (25,774)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (20,875)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (19,608)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
State and local income taxes, net of federal income tax benefit 15,017us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (3,641)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (2,076)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Fair market value over tax basis of charitable contributions (547)us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions (2,007)us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions
Other, net (1,598)us-gaap_IncomeTaxReconciliationOtherAdjustments 1,353us-gaap_IncomeTaxReconciliationOtherAdjustments (655)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision for (benefit from) income taxes $ 91,692us-gaap_IncomeTaxExpenseBenefit $ (24,459)us-gaap_IncomeTaxExpenseBenefit $ (66,492)us-gaap_IncomeTaxExpenseBenefit
Income tax benefit at the federal statutory tax rate of 35%, Rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Statutory depletion, Rate (8.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion 563.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion 16.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion
State and local income taxes, net of federal income tax benefit, Rate 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 98.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Fair market value over tax basis of charitable contributions, Rate (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions
Other, net, Rate (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (36.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total Effective tax rate 30.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 660.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 55.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations