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Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 16, 2014
Results of National Coal of Alabama included in the Company's Consolidated Statements of Operations                          
Revenues   $ 286,519 $ 239,107 $ 196,500 $ 193,734 $ 297,285 $ 221,714 $ 200,370 $ 177,413 $ 915,860 $ 896,782 $ 932,666  
Operating profit   21,538 $ 5,760 $ 1,288 $ 3,241 (73,156) $ 11,323 $ (3,891) $ (585) 31,827 (66,309) $ 61,336  
Recognized identified assets acquired and liabilities assumed                          
Goodwill $ 6,253 $ 6,253       $ 6,253       6,253 6,253    
Weston Products, LLC                          
Business Acquisition [Line Items]                          
Acquisition related costs                   $ 200 $ 400    
Results of National Coal of Alabama included in the Company's Consolidated Statements of Operations                          
Revenues 1,102                        
Operating profit $ (193)                        
Recognized identified assets acquired and liabilities assumed                          
Accounts receivable                         $ 6,100
Inventory                         5,113
Other current assets                         624
Property, plant and equipment (including mineral rights)                         590
Intangible assets                         10,100
Total assets acquired                         22,527
Other current liabilities                         3,367
Total liabilities assumed                         3,367
Net assets acquired                         19,160
Purchase price                         25,413
Goodwill                         $ 6,253