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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2017
$
(104,822
)
 
$
(89
)
 
$
(84,062
)
 
$
(188,973
)
Other comprehensive loss before reclassifications
(917
)
 
663

 
(26,397
)
 
(26,651
)
Amounts reclassified from accumulated other
    comprehensive loss
3,358

 
10

 
—

 
3,368

 Other comprehensive loss
2,441

 
673

 
(26,397
)
 
(23,283
)
Balance at September 30, 2018
$
(102,381
)
 
$
584

 
$
(110,459
)
 
$
(212,256
)