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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 17, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                        
Consolidated revenue   $ 213,893 $ 248,884 $ 229,201 $ 195,728 $ 227,928 $ 217,073 $ 174,188 $ 181,249 $ 887,706 $ 800,438 $ 1,124,111
Total Assets   1,698,701       1,714,776       1,698,701 1,714,776 1,802,160
Capital Expenditures                   16,001 39,331 43,598
Adjusted EBITDA                   151,428 120,035 165,232
Depreciation and depletion                   (72,270) (27,218) (66,064)
Amortization of port access rights                   0 0 (3,710)
Accretion                   (7,072) (6,645) (12,555)
Impairments                   0 (4,609) (91,541)
Debt restructuring costs $ (4,700)         (200) $ (4,500)     (23) (4,665) 0
Derivative financial instruments                        
Exclusion of fair value mark-to-market gains (losses)                   (2,672) 8,180 (30,635)
Inclusion of cash amounts (received) paid                   1,920 3,305 585
Total derivative financial instruments                   (752) 11,485 (30,050)
Interest expense, net                   (40,877) (47,296) (47,391)
Loss (income) from unconsolidated affiliates, net of tax                   (713) (657) (1,200)
Non-cash throughput amortization expense and contract termination payments                   (20,058) 0 0
Income (loss) before income tax provision and earnings from unconsolidated affiliates                   (36,822) 18,971 (128,720)
FN - Excludes premiums paid at contract inception                   0 0 5,813
United States [Member]                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   675,703 767,343 972,633
South Korea                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   184,135 14,181 120,719
Other                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   27,868 18,914 30,759
Intersegment Elimination                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   (54,868) (11,999) (46,847)
Total Assets   323       (314)       323 (314) (174)
Owned and Operated Mines                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   715,889 738,579 974,623
Total Assets   1,460,512       1,516,881       1,460,512 1,516,881 1,578,692
Capital Expenditures                   13,997 37,156 38,042
Adjusted EBITDA                   142,814 143,666 209,931
Logistics and Related Activities                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   222,451 43,553 185,820
Total Assets   49,085       51,586       49,085 51,586 55,597
Capital Expenditures                   0 0 0
Adjusted EBITDA                   8,614 (23,631) (44,699)
Other                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   4,234 30,305 10,515
Total Assets   $ 188,781       $ 146,623       188,781 146,623 168,045
Capital Expenditures                   2,004 2,175 5,556
Other | Operating Segments [Member]                        
Segment Reporting Information [Line Items]                        
Adjusted EBITDA                   $ (46,485) $ (21,461) $ (41,442)