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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventories  
Schedule of inventories, net
June 30,December 31,
20152014
Materials and supplies $ 77,399 $ 77,736
Less: Obsolescence allowance(1,101)(1,102)
Material and supplies, net 76,298 76,634
Coal inventory 2,415 3,168
Inventories, net$ 78,714 $ 79,802