Bank Debt (Details) (USD $) | 9 Months Ended |
Sep. 30, 2014 |
Debt Instrument [Line Items] | ' |
Deferred financing costs expensed | $1,000,000 |
Debt maturity date | 29-Aug-19 |
PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Closing costs of debt | 6,800,000 |
Loan initiation amortization period | '5 years |
Credit agreement, amount outstanding | 345,600,000 |
Credit facility, maximum borrowing capacity | 398,000,000 |
Maximum [Member] | ' |
Debt Instrument [Line Items] | ' |
Maximum leverage ratio | 325.00% |
Revolving Credit Facility [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Credit facility, maximum borrowing capacity | 250,000,000 |
Term Loan [Member] | ' |
Debt Instrument [Line Items] | ' |
Amortization period of loan | '5 years |
Term Loan [Member] | Debt Instrument, Redemption, Period Five [Member] | ' |
Debt Instrument [Line Items] | ' |
Loan annual amortization | 20.00% |
Term Loan [Member] | Debt Instrument, Redemption, Period Four [Member] | ' |
Debt Instrument [Line Items] | ' |
Loan annual amortization | 20.00% |
Term Loan [Member] | Debt Instrument, Redemption, Period One [Member] | ' |
Debt Instrument [Line Items] | ' |
Loan annual amortization | 10.00% |
Term Loan [Member] | Debt Instrument, Redemption, Period Three [Member] | ' |
Debt Instrument [Line Items] | ' |
Loan annual amortization | 15.00% |
Term Loan [Member] | Debt Instrument, Redemption, Period Two [Member] | ' |
Debt Instrument [Line Items] | ' |
Loan annual amortization | 15.00% |
Term Loan [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt face amount | 175,000,000 |
Sunrise Coal [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Percentage decrease in amount of debt with maximum interest rate per quarter after commencement date | 10.00% |
Date that the percentage of debt with a maximum interest rate begins to decrease quarterly | 31-Mar-16 |
Sunrise Coal [Member] | Maximum [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Interest rate maximum | 5.00% |
Sunrise Coal [Member] | Revolving Credit Facility [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Amount of debt with maximum interest rate | 100,000,000 |
Sunrise Coal [Member] | Term Loan [Member] | PNC Bank [Member] | ' |
Debt Instrument [Line Items] | ' |
Amount of debt with maximum interest rate | $175,000,000 |
Leverage Ratio Less Than 1 [Member] | London Interbank Offered Rate (LIBOR) [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt, interest rate spread on variable rate | 2.25% |
Leverage Ratio Between 1 and 1.5 [Member] | London Interbank Offered Rate (LIBOR) [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt, interest rate spread on variable rate | 2.50% |
Leverage Ratio Between 1.5 and 2 [Member] | London Interbank Offered Rate (LIBOR) [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt, interest rate spread on variable rate | 2.75% |
Leverage Ratio Between 2 and 2.5 [Member] | London Interbank Offered Rate (LIBOR) [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt, interest rate spread on variable rate | 3.00% |
Leverage Ratio Above 2.5 [Member] | London Interbank Offered Rate (LIBOR) [Member] | ' |
Debt Instrument [Line Items] | ' |
Debt, interest rate spread on variable rate | 3.50% |