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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments, future settlement
At June 30, 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
$
10,423

 
$
—

Average silver price per ounce
$
15.22

 
$
—

Notional ounces
685,006

 
—

 
 
 
 
Provisional gold sales contracts
$
9,663

 
$
—

Average gold price per ounce
$
1,302

 
$
—

Notional ounces
7,424

 
—

 
 
 
 
Provisional zinc sales contracts
$
16,448

 
$
—

Average zinc price per pound
$
1.14

 
$
—

Notional pounds
14,401,624

 
—

 
 
 
 
Provisional lead sales contracts
$
7,964

 
$
—

Average lead price per pound
$
0.89

 
$
—

Notional pounds
8,996,543

 
—

 
 
 
 
Fixed interest rate swap payable
$
967

 
$
—

Fixed Interest rate
2.51
%
 
—

Notional dollars
$
75,000

 
$
—

 
 
 
 
Variable interest rate swap receivable
$
787

 
$
—

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:
 
June 30, 2019
In thousands
Prepaid expenses and other
 
Accrued liabilities and other
Provisional metal sales contracts
$
926

 
$
2,480

Interest rate swaps
—

 
180

 
$
926

 
$
2,660

 
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 and six months ended June 30, 2019 and 2018, respectively (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Financial statement line
Derivative
2019
 
2018
 
2019
 
2018
Revenue
Provisional metal sales contracts
$
(1,944
)
 
$
(273
)
 
$
(1,694
)
 
$
(20
)
Fair value adjustments, net
Zinc options
—

 
219

 
—

 
363

Fair value adjustments, net
Interest rate swaps
(132
)
 
(188
)
 
(188
)
 
(188
)
 
 
$
(2,076
)
 
$
(242
)
 
$
(1,882
)
 
$
155