XML 132 R100.htm IDEA: XBRL DOCUMENT v3.8.0.1
Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Long term debt and capital lease obligations        
Current $ 30,753 $ 11,955    
Debt 380,569 198,682    
Interest paid on Revolving Credit Facility 885 0 $ 0  
Interest Paid on Convertible Notes due 2028 0 13 54  
Interest expenses incurred for various debt instruments        
Interest paid on Senior Notes due 2024 8,608 0 0  
Interest Paid on Senior Notes due 2021 6,221 28,871 33,437  
Interest paid on term loan due 2020 0 4,939 4,715  
Interest Paid on Capital Leases 1,621 1,422 999  
Accretion of Franco Nevada royalty obligation 0 1,211 6,567  
Debt Issuance Cost (Deprecated 2016-01-31) 809 1,933 2,257  
Amortization of debt issuance costs (71) (345) (409)  
Accretion 260 0 0  
Interest Expense, Debt 42 58 350  
Capitalized interest (1,935) (1,206) (2,992)  
Total interest expense, net of capitalized interest 16,440 36,896 $ 44,978  
Revolving Credit Facility        
Long term debt and capital lease obligations        
Debt 100,000 [1] 0 [2]    
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] 245,088 0    
Senior Notes due 2021        
Long term debt and capital lease obligations        
Debt [2] 0 175,991    
Stated interest rate       7.875%
Capital Lease Obligations [Member]        
Long term debt and capital lease obligations        
Debt 35,481 22,691    
Revolving Credit Facility        
Long term debt and capital lease obligations        
Current [2] 0 0    
Silvertip Debt Obligation [Member]        
Long term debt and capital lease obligations        
Current 14,194 0    
Senior Notes due 2024        
Long term debt and capital lease obligations        
Current [1] 0 0    
Senior Notes due 2021        
Long term debt and capital lease obligations        
Current [2] 0 0    
Capital Lease Obligations [Member]        
Long term debt and capital lease obligations        
Current $ 16,559 $ 11,955    
Revolving Credit Facility        
Long term debt and capital lease obligations        
Stated interest rate 3.70%      
[1] Net of unamortized debt issuance costs of $4.9 million at December 31, 2017.
[2] Net of unamortized debt issuance costs and premium received of $2.0 million at December 31, 2016.