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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.

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