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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments, future settlement
At September 30, 2018, the Company had the following derivative instruments that settle as follows:
In thousands except average prices and notional ounces
2018
 
Thereafter
Provisional silver sales contracts
$
1,444

 
$
—

Average silver price per ounce
$
14.61

 
$
—

Notional ounces
98,832

 
—

 
 
 
 
Provisional gold sales contracts
$
14,802

 
$
—

Average gold price per ounce
$
1,224

 
$
—

Notional ounces
12,089

 
—

 
 
 
 
Provisional zinc sales contracts
$
2,123

 
$
—

Average zinc price per pound
$
1.20

 
$
—

Notional pounds
1,772,075

 
—

 
 
 
 
Provisional lead sales contracts
$
1,130

 
$
—

Average lead price per pound
$
0.92

 
$
—

Notional pound
1,230,193

 
—

 
 
 
 
Zinc put options purchased
$
2,700


$
—

Average zinc strike price per metric ton
$
3,000

 
$
—

Notional metric tons
900

 
—

 
 
 
 
Zinc call options sold
$
(3,645
)
 
$
—

Average zinc strike price per metric ton
$
4,050

 
$
—

Notional metric tons
900

 
—

 
 
 
 
Fixed interest rate swap payable
$
960

 
$
—

Fixed Interest rate
2.46
%
 
—

Notional dollars
$
50,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
979

 
$
—

Average variable interest rate
2.51
%
 
$
—

Notional dollars
$
50,000

 
$
—
Fair value of the derivative instruments
The following summarizes the classification of the fair value of the derivative instruments:
 
September 30, 2018
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
Provisional metal sales contracts
$
310

 
$
267

Zinc options
339

 
—

Interest rate swaps
68

 
—

 
$
717

 
$
267

 
December 31, 2017
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
Provisional metal sales contracts
$
251

 
$
222
Gain losses on derivative instruments
The following represent mark-to-market gains (losses) on derivative instruments for the three and nine months ended September 30, 2018 and 2017, respectively (in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
Financial statement line
Derivative
2018
 
2017
 
2018
 
2017
Revenue
Provisional metal sales contracts
$
34

 
$
147

 
$
15

 
$
596

Fair value adjustments, net
Zinc options
225

 
—

 
588

 
—

Fair value adjustments, net
Interest rate swaps
206

 
—

 
18

 
—

 
 
$
465

 
$
147

 
$
621

 
$
596