Fair Value Measurement - Realized Unrealized Derivatives, net (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
$ 777
|
$ 137
|
$ 1,423
|
| Unrealized (loss) gain |
225
|
(184)
|
291
|
| Total realized/ unrealized derivatives, net |
1,002
|
(47)
|
1,714
|
| Gold |
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
(47)
|
623
|
318
|
| Unrealized (loss) gain |
|
(237)
|
117
|
| Total realized/ unrealized derivatives, net |
(47)
|
386
|
435
|
| Silver. |
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
(44)
|
344
|
167
|
| Unrealized (loss) gain |
(159)
|
(244)
|
208
|
| Total realized/ unrealized derivatives, net |
(203)
|
100
|
375
|
| Copper |
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
73
|
35
|
17
|
| Unrealized (loss) gain |
6
|
(15)
|
114
|
| Total realized/ unrealized derivatives, net |
79
|
20
|
131
|
| Lead |
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
163
|
(143)
|
(44)
|
| Unrealized (loss) gain |
(2)
|
59
|
(64)
|
| Total realized/ unrealized derivatives, net |
161
|
(84)
|
(108)
|
| Zinc |
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
| Realized (loss) gain |
632
|
(722)
|
965
|
| Unrealized (loss) gain |
380
|
253
|
(84)
|
| Total realized/ unrealized derivatives, net |
$ 1,012
|
$ (469)
|
$ 881
|