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Other Long-Term Assets (Schedule of Other Long-Term Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Long-term assets:    
Advance coal royalties $ 8,432 $ 6,563
Marketable equity securities available for sale, at fair value (restricted) [1] 1,826 1,763
Purchased coal contract - See Note 9 6,407  
Other 3,345 3,090
Long-term assets $ 20,010 $ 11,416
[1] Held by Sunrise Indemnity, Inc., our wholly-owned captive insurance company.