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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2020
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, 2019$(139,102) $(3,182) $(117,458) $(259,742) 
Other comprehensive loss before reclassifications
(872) (2,844) (36,439) (40,155) 
Amounts reclassified from accumulated other
    comprehensive loss
1,811  389  —  2,200  
 Other comprehensive loss939  (2,455) (36,439) (37,955) 
Balance at March 31, 2020$(138,163) $(5,637) $(153,897) $(297,697)