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v3.22.4

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Asset (liability) |  |
Post-employment benefits other than pensions | $ 1,230 | $ 1,714
Other reserves | 1,831 | 1,901
Deferred compensation | 3,850 | 3,263
Environmental reserves | 1,321 | 1,358
Inventory | 6,118 | 0
Research expenditures | 7,069 | 0
Revenue recognition | 7,878 | 5,027
Lease liabilities | 12,651 | 11,639
Interest expense carryforward | 12,470 | 14,163
Pensions | 0 | 1,393
Accrued compensation expense | 5,477 | 6,410
Net operating loss and credit carryforwards | 9,915 | 11,423
Subtotal | 69,810 | 58,291
Valuation allowance | (4,935) | (4,957)
Total deferred tax assets | 64,875 | 53,334
Depreciation | (42,481) | (24,484)
Lease assets | (12,078) | (11,184)
Inventory | 0 | (2,329)
Amortization | (32,925) | (35,542)
Mine development | 0 | (917)
Pensions | (400) | 0
Unrealized gains | (1,940) | (663)
Total deferred tax liabilities | (89,824) | (75,119)
Net deferred tax liabilities | $ (24,949) | $ (21,785)

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