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Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2019
Supplemental Income Statement Elements [Abstract]  
Restructuring and related costs
Restructuring and Impairment Charges
The components of “Restructuring and impairment charges” were as follows:
 
Years Ended December 31,
(Dollars in thousands)
2019
 
2018
 
2017
Restructuring charges
 
 
 
 
 
Global headquarters relocation
$
—

 
$
550

 
$
2,760

Facility consolidation
948

 
1,982

 
—

Total restructuring charges
948

 
2,532

 
2,760

Impairment charges
 
 
 
 
 
Fixed assets impairment charges
1,537

 
1,506

 
—

Other impairment charges
—

 
—

 
807

Total impairment charges
1,537

 
1,506

 
807

Total restructuring and impairment charges
$
2,485

 
$
4,038

 
$
3,567
Restructuring and impairment charges
The following table summarizes the allocation of restructuring and impairment charges to our operating segments:
 
Years Ended December 31,
(Dollars in thousands)
2019
 
2018
 
2017
Advanced Connectivity Solutions
 
 
 
 
 
Allocated restructuring charges
$
—

 
$
244

 
$
1,305

Allocated impairment charges
1,537

 
1,506

 
161

Elastomeric Material Solutions
 
 
 
 
 
Allocated restructuring charges
948

 
2,152

 
834

Allocated impairment charges
—

 
—

 
103

Power Electronics Solutions
 
 
 
 
 
Allocated restructuring charges
—

 
136

 
621

Allocated impairment charges
—

 
—

 
543

Total restructuring and impairment charges
$
2,485

 
$
4,038

 
$
3,567
Schedule of Income Statement Supplemental Disclosures
The components of “Other operating (income) expense, net” were as follows:
 
Years Ended December 31,
(Dollars in thousands)
2019
 
2018
 
2017
Lease income
$
(989
)
 
$
(948
)
 
$
—

Depreciation on leased assets
1,907

 
3,512

 
—

Loss (gain) on sale or disposal of property, plant and equipment
756

 
(164
)
 
(5,329
)
Gain from antitrust litigation settlement
—

 
(4,231
)
 
—

Indemnity claim settlements from acquisitions
(715
)
 
(700
)
 
—

Economic incentive grants
—

 
(556
)
 
—

Total other operating (income) expense, net
$
959

 
$
(3,087
)
 
$
(5,329
)
Interest Income and Interest Expense Disclosure
The components of “Interest expense, net” were as follows:
 
Years Ended December 31,
(Dollars in thousands)
2019
 
2018
 
2017
Interest on revolving credit facility
$
7,378

 
$
6,304

 
$
5,115

Interest rate swap settlements
(200
)
 
(247
)
 
51

Line of credit fees
576

 
573

 
555

Debt issuance amortization costs
552

 
552

 
549

Interest on finance leases
127

 
172

 
169

Interest income
(1,610
)
 
(804
)
 
(379
)
Other
46

 
79

 
71

Total interest expense, net
$
6,869

 
$
6,629

 
$
6,131