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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax Amounts included in accumulated other comprehensive loss, net of tax, were as follows:
 
Unrecognized Net
Defined Benefit
Plan Costs		Change in Fair
Value of
Derivatives		Foreign
Currency
Translation		Total
 (Dollars in thousands)
Balance at December 31, 2020$(168,604)$(4,656)$(87,693)$(260,953)
Other comprehensive loss before reclassifications
— 162 (33,372)(33,210)
Amounts reclassified from accumulated other
    comprehensive loss
1,878 479 — 2,357 
 Other comprehensive loss1,878 641 (33,372)(30,853)
Balance at March 31, 2021$(166,726)$(4,015)$(121,065)$(291,806)