Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Provisional gain (loss) on derivatives and commodity contracts	$ (490)	$ 959	$ 337
Net derivative gain (loss)	0	0	(178)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	1,200
Interest rate swap
Derivative [Line Items]
Net derivative gain (loss)	0	$ 0	$ (178)
Designated as Hedging Instrument | Gold zero cost collars
Derivative [Line Items]
After tax gains in AOCI	$ 1,200