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RESTRUCTURING EXPENSE
 9 Months Ended
Sep. 30, 2023
Restructuring and Related Activities [Abstract]  
RESTRUCTURING EXPENSE RESTRUCTURING EXPENSEWe approved various restructuring plans related to the consolidation of product lines and associated facility closures and workforce reductions during prior periods, which we expect to be completed during 2023. We recognized charges of $0.1 million and $6.3 million during the three and nine months ended September 30, 2023, respectively, consisting primarily of contract termination costs, inventory obsolescence, and employee severance and related benefits. During the three and nine months ended September 30, 2022, we recorded restructuring expense of $69.8 million and $84.9 million, respectively.
The following table presents the restructuring expense by segment as classified in our condensed consolidated statements of income.
 Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2023202220232022
Segment restructuring expense (income):
Production Chemical Technologies$58 $(335)$4,636 $11,637 
Production & Automation Technologies— 4,282 785 260 
Drilling Technologies— — — — 
Reservoir Chemical Technologies32 63,458 855 69,559 
Corporate and other— 2,350 4 3,403 
Total$90 $69,755 $6,280 $84,859 
Statements of Income classification:
Cost of goods and services$29 $66,488 $2,573 $67,496 
Selling, general and administrative expense61 3,267 3,707 17,363 
Total$90 $69,755 $6,280 $84,859 

Our liability balance for restructuring expense at September 30, 2023 reflects contract termination costs, employee severance and related benefits initiated during the period. Additional programs may be initiated during the remainder of 2023 with related restructuring charges.

The following table details our restructuring accrual activities during the nine months ended September 30, 2023:

(in thousands)Restructuring Accrual Balance
December 31, 2022$28,518 
Restructuring charges6,280 
Asset sales and write-offs(705)
Payments(17,432)
Other, including foreign currency translation(3)
September 30, 2023$16,658