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Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments, future settlement
At March 31, 2019, 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
$
5,712

 
$
—

Average silver price per ounce
$
15.11

 
$
—

Notional ounces
378,139

 
—

 
 
 
 
Provisional gold sales contracts
$
10,657

 
$
—

Average gold price per ounce
$
1,303

 
$
—

Notional ounces
8,178

 
—

 
 
 
 
Provisional zinc sales contracts
$
11,581

 
$
—

Average zinc price per pound
$
1.27

 
$
—

Notional pounds
9,099,116

 
—

 
 
 
 
Provisional lead sales contracts
$
4,234

 
$
—

Average lead price per pound
$
0.91

 
$
—

Notional pounds
4,648,252

 
—

 
 
 
 
Fixed interest rate swap payable
$
323


$
—

Fixed Interest rate
2.46
%
 
—

Notional dollars
$
50,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
326

 
$
—

Average variable interest rate
2.49
%
 
$
—

Notional dollars
$
50,000

 
$
—

 
 
 
 
Fixed interest rate swap payable
$
960

 
$
—

Fixed Interest rate
2.50
%
 
—

Notional dollars
$
75,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
911

 
$
—

Average variable interest rate
2.49
%
 
$
—

Notional dollars
$
75,000

 
$
—
Fair value of the derivative instruments
The following summarizes the classification of the fair value of the derivative instruments:
 
March 31, 2019
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
Provisional metal sales contracts
$
550

 
$
161

Interest rate swaps
3

 
(49
)
 
$
553

 
$
112

 
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
Gain losses on derivative instruments
The following represent mark-to-market gains (losses) on derivative instruments for the three months ended March 31, 2019 and 2018, respectively (in thousands):
 
 
Three Months Ended March 31,
Financial statement line
Derivative
2019
 
2018
Revenue
Provisional metal sales contracts
$
250

 
$
253

Fair value adjustments, net
Zinc options
—

 
145

Fair value adjustments, net
Interest rate swaps
(46
)
 
—

 
 
$
204

 
$
398