Derivative Financial Instruments - Summary of Mark-to-Market Gain (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net, pretax	$ (5,296)	$ (2,462)	$ 3,824	$ 2,192
Fair value adjustments, net	(2,076)	(242)	(1,882)	155
Provisional metal sales contracts
Derivative Instruments, Gain (Loss) [Line Items]
Provisional gain (loss) on derivatives and commodity contracts	(1,944)	(273)	(1,694)	(20)
Zinc options
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain (loss)	0	219	0	363
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain (loss)	$ (132)	$ (188)	$ (188)	$ (188)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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