Contractual interest rate for funds borrowed, under the debt agreement.

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Fair Value Measurements - Narrative (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	May 31, 2017
Senior Notes due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net unamortized debt issuance costs	$ 0	$ 2,400,000
Stated interest rate	5.125%		5.875%
Victoria Gold Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative, fair value	$ 0