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(6) Other Long-Term Assets and Other Income (Details) - Other Long-Term Income (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Other income:    
MSHA reimbursements* $ 2,053 [1] $ 4,236 [1]
Coal storage fees 964 127
Miscellaneous 598 575
$ 3,615 $ 4,938
[1] *See "MSHA Reimbursements" on page 13.