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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Long term debt and capital lease obligations          
Current $ 14,375   $ 14,375   $ 12,039
Debt 274,523   274,523   198,857
Interest expenses incurred for various debt instruments          
Interest paid on Senior Notes due 2024 3,672 $ 0 4,937 $ 0  
Interest Paid on Senior Notes due 2021 0 7,337 6,221 22,250  
Interest paid on term loan due 2020 0 417 0 4,939  
Interest Paid on Capital Leases 413 399 1,115 1,079  
Accretion of Franco Nevada royalty obligation 0 49 0 1,211  
Debt Issuance Cost (Deprecated 2016-01-31) 180 388 518 1,650  
Amortization of debt issuance costs 0 (90) (71) (272)  
Interest Expense, Debt 13 40 30 95  
Capitalized interest (672) (472) (1,809) (889)  
Total interest expense, net of capitalized interest 3,606 $ 8,068 10,941 $ 30,063  
Senior Notes due 2024 [Member]          
Long term debt and capital lease obligations          
Debt [1] 244,934   244,934   0
Senior Notes due 2021 [Member]          
Long term debt and capital lease obligations          
Debt [2] $ 0   $ 0   175,991
Debt Instrument, Interest Rate, Stated Percentage 7.875%   7.875%    
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Debt $ 29,589   $ 29,589   22,866
Senior Notes due 2024 [Member]          
Long term debt and capital lease obligations          
Current [1] 0   0   0
Senior Notes due 2021 [Member]          
Long term debt and capital lease obligations          
Current [2] 0   0   0
Capital Lease Obligations [Member]          
Long term debt and capital lease obligations          
Current $ 14,375   $ 14,375   $ 12,039
[1] Net of unamortized debt issuance costs of $5.1 million at September 30, 2017.
[2] Net of unamortized debt issuance costs and premium received of $2.0 million at December 31, 2016.