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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2017
$
(83,105
)
 
$
540

 
$
(141,291
)
 
$
(223,856
)
Other comprehensive income before
    reclassifications
(8,486
)
 
(527
)
 
63,874

 
54,861

Amounts reclassified from accumulated
    other comprehensive loss
2,193

 
(86
)
 
—

 
2,107

 Other comprehensive income
(6,293
)
 
(613
)
 
63,874

 
56,968

Adoption of accounting standards update related to reclassification of certain tax effects
(15,424
)
 
(16
)
 
(6,645
)
 
(22,085
)
Balance at December 31, 2017
(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 loss
15,364

 
(2,174
)
 
(4,124
)
 
9,066

Balance at December 31, 2019
$
(139,102
)
 
$
(3,182
)
 
$
(117,458
)
 
$
(259,742
)