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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Long term debt and capital lease obligations      
Current $ 17,040   $ 30,753
Debt 396,984   380,569
Interest paid on Revolving Credit Facility 1,152 $ 0  
Interest expenses incurred for various debt instruments      
Interest paid on Senior Notes due 2024 3,673 0  
Interest Paid on Senior Notes due 2021 0 3,504  
Interest Paid on Capital Leases 524 306  
Debt Issuance Cost (Deprecated 2016-01-31) 325 166  
Amortization of debt issuance costs 0 (43)  
Accretion 324 0  
Interest Expense, Debt 107 9  
Capitalized interest (140) (363)  
Total interest expense, net of capitalized interest 5,965 $ 3,579  
Revolving Credit Facility      
Long term debt and capital lease obligations      
Debt [1] 115,000   100,000
Silvertip Debt Obligation [Member]      
Long term debt and capital lease obligations      
Debt 0   0
Senior Notes due 2024      
Long term debt and capital lease obligations      
Debt [1] 245,280   245,088
Capital Lease Obligations [Member]      
Long term debt and capital lease obligations      
Debt 36,704   35,481
Revolving Credit Facility      
Long term debt and capital lease obligations      
Current 0   0
Silvertip Debt Obligation [Member]      
Long term debt and capital lease obligations      
Current 0   14,194
Senior Notes due 2024      
Long term debt and capital lease obligations      
Current [1] 0   0
Capital Lease Obligations [Member]      
Long term debt and capital lease obligations      
Current $ 17,040   $ 16,559
Revolving Credit Facility      
Long term debt and capital lease obligations      
Stated interest rate 4.10%    
[1] Net of unamortized debt issuance costs of $4.7 million and $4.9 million at March 31, 2018 and December 31, 2017, respectively.