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Bank Debt (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) agreement | Mar. 18, 2016 USD ($) | Mar. 17, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Credit agreement, amount outstanding | $ 239.0 |  |
Borrowing capacity | 63.0 |  |
Maximum annual capex | 30.0 |  |
Total laquidity | $ 82.0 |  |
Fixed charge coverage ratio | 211.00% |  |
Leverage ratio | 295.00% |  |
Number of interest rate swaps | agreement | 2 |  |
Fair value (liability) of interest rate swaps | $ (0.2) |  |
Fair value of long term asset | 0.3 |  |
Fair value of current liability | 0.5 |  |
PNC Bank [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Closing costs of debt | $ 9.1 |  |
Loan initiation amortization period | 5 years |  |
Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Intererst rate effective percentage | 4.78% |  |
Debt maturity date | Aug. 29, 2019 |  |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed charge coverage ratio | 125.00% |  |
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Leverage ratio |  |  | 275.00%
Maximum [Member] | June 30, 2018 and September 30, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Leverage ratio | 400.00% |  |
Maximum [Member] | June 30, 2017 through March 31, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Leverage ratio | 425.00% |  |
Maximum [Member] | September 30, 2016 through March 31, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Leverage ratio | 450.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, interest rate spread on variable rate | 4.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, interest rate spread on variable rate | 2.25% |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, interest rate spread on variable rate | 4.00% |  |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement, amount outstanding | $ 137.0 |  |
Revolving Credit Facility [Member] | PNC Bank [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, maximum borrowing capacity |  | $ 200.0 | $ 250.0
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement, amount outstanding | $ 102.0 |  |
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 | Mar. 31, 2016 |  |
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 | $ 100.0 |  |

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