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Supplemental Financial Information (Tables)
 9 Months Ended
Sep. 30, 2021
Supplemental Income Statement Elements [Abstract]  
Schedule of Restructuring and Impairment Charges The components of “Restructuring and impairment charges” line item in the condensed consolidated statements of operations, which contains restructuring charges and related expenses, as well as impairment charges, were as follows:
Three Months EndedNine Months Ended
(Dollars in thousands)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Restructuring charges
Manufacturing footprint optimization622 9,027 2,875 9,027 
Total restructuring charges622 9,027 2,875 9,027 
Impairment charges
Fixed asset impairment charges385 334 385 334 
Other impairment charges— 52 — 52 
Total impairment charges385 386 385 386 
Total restructuring and impairment charges$1,007 $9,413 $3,260 $9,413 
Schedule of Severance Activity Severance and related benefits activity related to the manufacturing footprint optimization plan is presented in the table below for the nine months ended September 30, 2021:
(Dollars in thousands)Manufacturing Footprint Optimization Restructuring Severance
Balance as of December 31, 2020$11,003 
Provisions81 
Payments(8,604)
Foreign currency translation adjustment(532)
Balance as of September 30, 2021$1,948 
Schedule of Other Operating (Income) Expense The components of “Other operating (income) expense, net” line item in the condensed consolidated statements of operations, were as follows:
Three Months EndedNine Months Ended
(Dollars in thousands)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
UTIS fire
Fixed assets write-offs— — 891 — 
Inventory charges43 — 363 — 
Professional services577 — 2,171 — 
Lease obligations60 — 600 — 
Lease impairments495 — 495 — 
Compensation & benefits614 — 1,458 — 
Third-party property claims4,650 — 4,650 — 
Other— — 76 — 
Insurance recoveries(5,017)— (6,495)— 
Total UTIS fire1,422 — 4,209 — 
(Gain) loss on sale or disposal of property, plant and equipment9 (4)(673)49 
Economic incentive grants— — — (145)
Total other operating (income) expense, net$1,431 $(4)$3,536 $(96)
Interest Income and Interest Expense Disclosure
The components of “Interest expense, net” line item in the condensed consolidated statements of operations, were as follows:
Three Months EndedNine Months Ended
(Dollars in thousands)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Interest on revolving credit facility$— $612 $106 $3,079 
Interest rate swap settlements— 2,769 — 3,191 
Line of credit fees292 112 856 430 
Debt issuance amortization costs178 138 536 414 
Interest on finance leases11 35 270 100 
Interest income(64)(135)(409)(724)
Other24 22 93 49 
Total interest expense, net$441 $3,553 $1,452 $6,539