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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Long term debt and capital lease obligations            
Current $ 13,014   $ 13,014     $ 12,039
Debt 271,766   271,766     198,857
Interest expenses incurred for various debt instruments            
Interest paid on Senior Notes due 2024 1,265 $ 0 1,265 $ 0    
Interest Paid on Senior Notes due 2021 2,717 7,457 6,221 14,913    
Interest paid on term loan due 2020 0 2,258 0 4,521    
Interest Paid on Capital Leases 383 416 689 680    
Accretion of Franco Nevada royalty obligation 0 397 0 1,162    
Debt Issuance Cost (Deprecated 2016-01-31) 172 631 338 1,262    
Amortization of debt issuance costs (28) (91) (71) (182)    
Interest Expense, Debt 14 21 30 56    
Capitalized interest (774) (214) (1,137) (417)    
Total interest expense, net of capitalized interest 3,749 $ 10,875 7,335 $ 21,995    
Senior Notes due 2024 [Member]            
Long term debt and capital lease obligations            
Debt [1] 244,827   244,827     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%   7.875%  
Capital Lease Obligations [Member]            
Long term debt and capital lease obligations            
Debt $ 26,939   $ 26,939     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 $ 13,014   $ 13,014     $ 12,039
[1] Net of unamortized debt issuance costs $5.2 million at June 30, 2017.
[2] Net of unamortized debt issuance costs and premium received of $2.0 million at December 31, 2016.