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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Long term debt and capital lease obligations          
Current $ 21,745   $ 21,745   $ 30,753
Debt 397,974   397,974   380,569
Interest expenses incurred for various debt instruments          
Interest paid on Senior Notes due 2024 3,672 $ 1,265 7,344 $ 1,265  
Interest Paid on Senior Notes due 2021 0 2,717 0 6,221  
Interest paid on Revolving Credit Facility 1,369 0 2,521 0  
Interest Paid on Capital Leases 515 383 1,039 689  
Debt Issuance Cost (Deprecated 2016-01-31) 324 172 649 338  
Amortization of debt issuance costs 0 (28) 0 (71)  
Accretion 327 0 651 0  
Interest Expense, Debt 6 9 114 18  
Capitalized interest (195) (774) (335) (1,137)  
Total interest expense, net of capitalized interest 6,018 $ 3,744 11,983 $ 7,323  
Revolving Credit Facility          
Long term debt and capital lease obligations          
Debt [1] 115,000   115,000   100,000
Silvertip Debt Obligation [Member]          
Long term debt and capital lease obligations          
Debt 0   0   0
Senior Notes due 2024          
Long term debt and capital lease obligations          
Debt [1] 245,471   245,471   245,088
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Debt 37,503   37,503   35,481
Revolving Credit Facility          
Long term debt and capital lease obligations          
Current 0   0   0
Silvertip Debt Obligation [Member]          
Long term debt and capital lease obligations          
Current 0   0   14,194
Senior Notes due 2024          
Long term debt and capital lease obligations          
Current [1] 0   0   0
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Current $ 21,745   $ 21,745   $ 16,559
Revolving Credit Facility          
Long term debt and capital lease obligations          
Stated interest rate 4.335%   4.335%    
[1] Net of unamortized debt issuance costs of $4.5 million and $4.9 million at June 30, 2018 and December 31, 2017, respectively.