Fair Value Measurement - Realized Unrealized Derivatives, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivatives, Fair Value [Line Items]
Realized (loss) gain	$ (1,212)	$ (246)	$ 814	$ 204
Unrealized gain (loss)	278	(232)	(1,878)	(48)
Total realized/ unrealized derivatives, net	(934)	(478)	(1,064)	156
Gold
Derivatives, Fair Value [Line Items]
Realized (loss) gain	(198)	(110)	(16)	(133)
Unrealized gain (loss)	(95)	28	(96)	58
Total realized/ unrealized derivatives, net	(293)	(82)	(112)	(75)
Silver.
Derivatives, Fair Value [Line Items]
Realized (loss) gain	(141)	(295)	13	(123)
Unrealized gain (loss)	(81)	(11)	30	10
Total realized/ unrealized derivatives, net	(222)	(306)	43	(113)
Copper
Derivatives, Fair Value [Line Items]
Realized (loss) gain	(158)	(4)	(173)	63
Unrealized gain (loss)	108	(16)	3	(24)
Total realized/ unrealized derivatives, net	(50)	(20)	(170)	39
Lead
Derivatives, Fair Value [Line Items]
Realized (loss) gain	(88)	72	(32)	146
Unrealized gain (loss)	96	(84)	(103)	(63)
Total realized/ unrealized derivatives, net	8	(12)	(135)	83
Zinc
Derivatives, Fair Value [Line Items]
Realized (loss) gain	(627)	91	1,022	251
Unrealized gain (loss)	250	(149)	(1,712)	(29)
Total realized/ unrealized derivatives, net	$ (377)	$ (58)	$ (690)	$ 222