Other Long-Term Assets and Other Income (Schedule of Other Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Other income:
MSHA reimbursements*		$ 3,672	[1]
Coal storage fees	383	1,238
Miscellaneous	1,366	768
Other income	$ 1,749	$ 5,678

[1] See “MSHA Reimbursements” in the MD&A section for a discussion of these amounts.