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Other Long-Term Assets and Other Income (Schedule of Other Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other income: |  |  |  |
MSHA reimbursements | [1] |  |  | $ 3,672
Coal storage fees |  | $ 600 | $ 383 | 1,238
Miscellaneous |  | 1,636 | 1,366 | 768
Other income |  | $ 2,236 | $ 1,749 | $ 5,678
[1] | See “MSHA Reimbursements” in the MD&A section for a discussion of these amounts.

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