Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block] [Table Text Block]

Minimum future lease payments under capital and operating leases with terms longer than one year are as follows:

At December 31, (In thousands)
	Operating leases		Capital leases
2018	$	5,220	$	18,758
2019	5,154		13,938
2020	4,669		11,018
2021	3,798		9,646
2022	2,646		3,510
Thereafter	4,099		40
Total	$	25,586	$	56,910
Less: imputed interest	—		(4,696		)
Net lease obligation	$	25,586	$	52,214

Long term debt and capital lease obligations

	December 31, 2017				December 31, 2016
In thousands	Current		Non-Current		Current		Non-Current
2024 Senior Notes, net(1)	$	—	$	245,088	$	—	$	—
2021 Senior Notes, net(2)	—		—		—		175,991
Revolving Credit Facility(3)	—		100,000		—		—
Capital lease obligations	16,559		35,481		11,955		22,691
Silvertip debt obligation	14,194		—		—		—
	$	30,753	$	380,569	$	11,955	$	198,682

⁽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.

⁽³⁾ Unamortized debt issuance costs of $1.9 million at December 31, 2017 included in Other Non-Current Assets.

Interest expenses incurred for various debt instruments

Interest Expense

	Year ended December 31,
In thousands	2017			2016			2015
2024 Senior Notes	$	8,608		$	—		$	—
2021 Senior Notes	6,221			28,871			$	33,437
Revolving Credit Facility	885			—			—
3.25% Convertible Senior Notes due 2028	—			13			54
Term Loan due 2020	—			4,939			4,715
Capital lease obligations	1,621			1,422			999
Accretion of Palmarejo gold production royalty obligation	—			1,211			6,567
Amortization of debt issuance costs	809			1,933			2,257
Accretion of debt premium	(71		)	(345		)	(409		)
Accretion of Silvertip contingent consideration	260			—			—
Other debt obligations	42			58			350
Capitalized interest	(1,935		)	(1,206		)	(2,992		)
Total interest expense, net of capitalized interest	$	16,440		$	36,896		$	44,978