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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Long term debt and capital lease obligations      
Current $ 13,451   $ 12,039
Debt 205,625   198,857
Interest expenses incurred for various debt instruments      
Interest Paid on Senior Notes due 2021 3,504 $ 7,457  
Interest paid on term loan due 2020 0 2,264  
Interest Paid on Capital Leases 306 265  
Accretion of Franco Nevada royalty obligation 0 765  
Debt Issuance Cost 166 631  
Amortization of debt issuance costs (43) (91)  
Interest Expense, Debt 16 32  
Capitalized interest (363) (203)  
Total interest expense, net of capitalized interest 3,586 $ 11,120  
Senior Notes due 2021 [Member]      
Long term debt and capital lease obligations      
Debt $ 176,114 [1]   175,991 [2]
Debt Instrument, Interest Rate, Stated Percentage 7.875%    
Capital Lease Obligations [Member]      
Long term debt and capital lease obligations      
Debt $ 29,511   22,866
Senior Notes due 2021 [Member]      
Long term debt and capital lease obligations      
Current 0   0
Capital Lease Obligations [Member]      
Long term debt and capital lease obligations      
Current $ 13,451   $ 12,039
[1] (1)Net of unamortized debt issuance costs and premium received of $1.9 million.
[2] (1)Net of unamortized debt issuance costs and premium received of $2.0 million.