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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Long term debt and capital lease obligations          
Current $ 22,696   $ 22,696   $ 30,753
Debt 406,494   406,494   380,569
Interest expenses incurred for various debt instruments          
Interest paid on Senior Notes due 2024 3,672 $ 3,672 11,016 $ 4,937  
Interest Paid on Senior Notes due 2021 0 0 0 6,221  
Interest paid on Revolving Credit Facility 1,515 0 4,035 0  
Interest Paid on Capital Leases 512 402 1,551 1,092  
Debt Issuance Cost (Deprecated 2016-01-31) 323 180 972 518  
Amortization of debt issuance costs 0 0 0 (71)  
Accretion 329 0 980 0  
Interest Expense, Debt 196 13 312 30  
Capitalized interest (729) (672) (1,065) (1,809)  
Total interest expense, net of capitalized interest 5,818 $ 3,595 17,801 $ 10,918  
Revolving Credit Facility          
Long term debt and capital lease obligations          
Debt [1] 120,000   120,000   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 [2] 245,662   245,662   245,088
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Debt 40,832   40,832   35,481
Revolving Credit Facility          
Long term debt and capital lease obligations          
Current [1] 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 [2] 0   0   0
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Current $ 22,696   $ 22,696   $ 16,559
Revolving Credit Facility          
Long term debt and capital lease obligations          
Stated interest rate 4.415%   4.415%    
[1] Unamortized debt issuance costs of $1.5 million and $1.9 million at September 30, 2018 and December 31, 2017, respectively, included in Other Non-Current Assets.
[2] Net of unamortized debt issuance costs of $4.3 million and $4.9 million at September 30, 2018 and December 31, 2017, respectively.