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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments, future settlement
At June 30, 2018, the Company had the following derivative instruments that settle as follows:
In thousands except average prices and notional ounces
2018
 
Thereafter
 
 
 
 
Provisional gold sales contracts
$
46,485

 
$
—

Average gold price per ounce
$
1,299

 
$
—

Notional ounces
35,787

 
—

 
 
 
 
Zinc put options purchased
$
5,400

 
$
—

Average zinc strike price per metric ton
$
3,000

 
$
—

Notional metric tons
1,800

 
—

 
 
 
 
Zinc call options sold
$
(7,290
)
 
$
—

Average zinc strike price per metric ton
$
4,050

 
$
—

Notional metric tons
1,800

 
—

 
 
 
 
Fixed interest rate swap payable
$
(1,281
)
 
$
—

Fixed Interest rate
2.46
%
 
—

Notional dollars
$
50,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
1,088

 
$
—

Average variable interest rate
2.09
%
 
$
—

Notional dollars
$
50,000

 
$
—
Fair value of the derivative instruments

    

The following summarizes the classification of the fair value of the derivative instruments:
 
June 30, 2018
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
 
Current portion of royalty obligation
 
Non-current portion of royalty obligation
Provisional silver and gold sales contracts
$
123

 
$
114

 
$
—

 
$
—

Zinc options
363

 
—

 
—

 
—

Interest rate swaps
—

 
188

 
—

 
—

 
$
486

 
$
302

 
$
—

 
$
—

 
December 31, 2017
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
 
Current portion of royalty obligation
 
Non-current portion of royalty obligation
Provisional silver and gold sales contracts
$
251

 
$
222

 
$
—

 
$
—
Gain losses on derivative instruments
The following represent mark-to-market gains (losses) on derivative instruments for the three and six months ended June 30, 2018, respectively (in thousands):
 
 
Three months ended June 30,
 
Six months ended June 30,
Financial statement line
Derivative
2018
 
2017
 
2018
 
2017
Revenue
Provisional silver and gold sales contracts
$
(273
)
 
$
(763
)
 
$
(20
)
 
$
449

Fair value adjustments, net
Zinc options
219

 
—

 
363

 
—

Fair value adjustments, net
Interest rate swaps
(188
)
 
—

 
(188
)
 
—

 
 
$
(242
)
 
$
(763
)
 
$
155

 
$
449