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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments, future settlement
At December 31, 2018, the Company had the following derivative instruments that settle as follows:
In thousands except average prices and notional ounces
2019
 
Thereafter
Provisional silver sales contracts
$
3,559

 
$
—

Average silver price per ounce
$
14.62

 
$
—

Notional ounces
243,383

 
—

 
 
 
 
Provisional gold sales contracts
$
31,936

 
$
—

Average gold price per ounce
$
1,257

 
$
—

Notional ounces
25,411

 
—

 
 
 
 
Provisional zinc sales contracts
$
6,334

 
$
—

Average zinc price per pound
$
1.20

 
$
—

Notional pounds
5,270,793

 
—

 
 
 
 
Provisional lead sales contracts
$
2,360

 
$
—

Average lead price per pound
$
0.92

 
$
—

Notional pound
2,568,165

 
—

 
 
 
 
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
$
636

 
$
—

Fixed Interest rate
2.46
%
 
—

Notional dollars
$
50,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
653

 
$
—

Average variable interest rate
2.50
%
 
$
—

Notional dollars
$
50,000

 
$
—
Fair value of the derivative instruments
The following summarizes the classification of the fair value of the derivative instruments:
 
December 31, 2018
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
Provisional metal sales contracts
$
784

 
$
644

Zinc options
113

 
—

Interest rate swaps
17

 
—

 
$
914

 
$
644

 
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 years ended December 31, 2018, 2017, and 2016 and 2017, respectively (in thousands):
 
 
Year ended December 31,
Financial statement line
Derivative
2018
 
2017
 
2016
Revenue
Provisional metal sales contracts
$
111

 
$
631

 
$
(239
)
Fair value adjustments, net
Palmarejo gold production royalty
—

 
—

 
(5,866
)
Fair value adjustments, net
Zinc options
753

 
—

 
—

Fair value adjustments, net
Silver and gold options
—

 
—

 
(1,582
)
Fair value adjustments, net
Interest rate swaps
(60
)
 
—

 
—

 
 
$
804

 
$
631

 
$
(7,687
)