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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
Income tax expenses benefit
Income (loss) before income taxes and income tax expense (benefit) are comprised of the following:
(Thousands)202220212020
Income (loss) before income taxes:
Domestic$90,403 $54,684 $(1,153)
Foreign12,697 22,641 9,428 
Total income (loss) before income taxes$103,100 $77,325 $8,275 
Income tax expense:
Current income tax expense (benefit):
Domestic$12,571 $14,603 $812 
Foreign2,806 3,205 1,851 
Total current$15,377 $17,808 $2,663 
Deferred income tax (benefit) expense:
Domestic$588 $(7,953)$(5,641)
Foreign1,145 (5,004)(4,209)
Total deferred$1,733 $(12,957)$(9,850)
Total income tax expense (benefit)$17,110 $4,851 $(7,187)
Effective income tax rate reconciliation
A reconciliation of the U.S. federal statutory income tax rate to the Company's effective income tax rate is as follows:
202220212020
U.S. federal statutory rate21.0 %21.0 %21.0 %
State and local income taxes, net of federal tax effect1.7 (0.3)(10.0)
Effect of excess of percentage depletion over cost depletion(3.1)(3.4)(43.0)
Foreign derived intangible income deduction(1.7)(2.3)(1.8)
Non-deductible goodwill impairment — 7.1 
Research and development tax credit(2.0)(1.2)(16.4)
Impact of foreign operations0.6 0.3 (5.3)
Non-deductible transaction costs 1.6 6.9 
Interest from tax authorities — (3.8)
Adjustment to unrecognized tax benefits(0.5)(1.9)1.8 
Equity compensation(0.9)(0.5)(5.3)
Non-deductible officers' compensation1.2 1.4 6.8 
Valuation allowance0.6 (8.5)(45.5)
Other items(0.3)0.1 0.6 
Effective tax rate16.6 %6.3 %(86.9)%
Deferred tax assets and liabilities Deferred tax assets and (liabilities) recorded in the Consolidated Balance Sheets consist of the following:
 December 31,
(Thousands)20222021
Asset (liability)
Post-employment benefits other than pensions$1,230 $1,714 
Other reserves1,831 1,901 
Deferred compensation3,850 3,263 
Environmental reserves1,321 1,358 
Inventory6,118 — 
Research expenditures7,069 — 
Revenue recognition7,878 5,027 
Lease liabilities12,651 11,639 
Interest expense carryforward12,470 14,163 
Pensions 1,393 
Accrued compensation expense5,477 6,410 
Net operating loss and credit carryforwards9,915 11,423 
Subtotal69,810 58,291 
Valuation allowance(4,935)(4,957)
Total deferred tax assets64,875 53,334 
Depreciation(42,481)(24,484)
Lease assets(12,078)(11,184)
Inventory (2,329)
Amortization(32,925)(35,542)
Mine development (917)
Pensions(400)— 
Unrealized gains
(1,940)(663)
Total deferred tax liabilities(89,824)(75,119)
Net deferred tax liabilities$(24,949)$(21,785)
Reconciliation of unrecognized tax benefits
A reconciliation of the Company’s unrecognized tax benefits for the year-to-date periods ended December 31, 2022 and 2021 is as follows:
(Thousands)20222021
Balance at January 1$1,142 $2,360 
Additions to tax provisions related to the current year 431 
Additions to tax positions related to prior years — 
Reduction to tax positions related to prior years(8)(45)
Lapses on statutes of limitations(482)(1,604)
Balance at December 31$652 $1,142