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Other Long-Term Assets and Other Income (Schedule of Other Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other income: |  |  |  |
MSHA reimbursements | [1] | $ 1,753 |  |
Coal storage fees |  |  | $ 600 | $ 383
Miscellaneous |  | 2,209 | 1,636 | 1,366
Other income |  | $ 3,962 | $ 2,236 | $ 1,749
[1] | See “MSHA Reimbursements” in the MD&A section for a discussion of these amounts.

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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=51671805&loc=d3e60722-111653 + Details
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