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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Depreciation and depletion $ (18,645) $ (19,102)
Accretion (1,821) (2,582)
Impairments 0 (4,154)
Debt restructuring costs 40 0
Derivative financial instruments    
Exclusion of fair value mark-to-market gains (losses) (2,344) (1,962)
Inclusion of cash amounts (received) paid 336 2,309
Total derivative financial instruments (2,008) 347
Interest expense, net (12,873) (11,014)
Income tax benefit (expense) 300 (1,421)
Throughput Amortization Contract Termination Payments (4,851) 0
Net income (loss) (20,108) (36,375)
Revenues Abstract    
Consolidated revenue 195,728 181,249
Capital Expenditures    
Capital Expenditures 4,993 10,038
Intersegment Elimination    
Segment Reporting Information [Line Items]    
Adjusted EBITDA (442) (58)
Revenues Abstract    
Consolidated revenue (7,424) (3,866)
Owned and Operated Mines    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 33,738 15,469
Impairments   (2,200)
Revenues Abstract    
Consolidated revenue 173,611 167,164
Capital Expenditures    
Capital Expenditures 4,596 8,873
Logistics and Related Activities    
Segment Reporting Information [Line Items]    
Adjusted EBITDA (2,564) (6,938)
Revenues Abstract    
Consolidated revenue 28,248 14,018
Corporate and Other    
Segment Reporting Information [Line Items]    
Adjusted EBITDA (10,302) (9,764)
Revenues Abstract    
Consolidated revenue 1,293 3,933
Capital Expenditures    
Capital Expenditures $ 397 $ 1,165