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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net deferred tax liabilities $ (140,361) $ (136,575)
Initial deferred tax liability associated with the Tahoe Acquisition 0 (24,080)
Recognized in net earnings in the year 22,798 20,861
Reduction due to Mexican de-consolidation payments applied to current tax 0 (705)
Other 102 138
Net deferred tax liabilities (117,461) (140,361)
Deferred tax assets 57,850 36,447
Deferred tax liabilities (175,311) (176,808)
Net deferred tax liability $ (117,461) $ (140,361)