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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Amounts Included in Accumulated Other Comprehensive Income (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 January 1, 2018$(104,822)$(89)$(84,062)$(188,973)
Other comprehensive loss before
reclassifications		(53,797)(766)(33,679)(88,242)
Amounts reclassified from accumulated
    other comprehensive loss
4,153 (153)4,407 8,407 
 Other comprehensive loss(49,644)(919)(29,272)(79,835)
Balance at December 31, 2018(154,466)(1,008)(113,334)(268,808)
Other comprehensive loss before
    reclassifications
4,895 (2,723)(4,124)(1,952)
Amounts reclassified from accumulated
    other comprehensive loss
10,469 549 — 11,018 
 Other comprehensive income15,364 (2,174)(4,124)9,066 
Balance at December 31, 2019(139,102)(3,182)(117,458)(259,742)
Other comprehensive loss before
    reclassifications
(36,660)(3,493)29,765 (10,388)
Amounts reclassified from accumulated
    other comprehensive loss
7,158 2,019 — 9,177 
 Other comprehensive loss(29,502)(1,474)29,765 (1,211)
Balance at December 31, 2020$(168,604)$(4,656)$(87,693)$(260,953)