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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 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
—

 
191

 
(21,821
)
 
(21,630
)
Amounts reclassified from accumulated other
    comprehensive loss
1,634

 
6

 
—

 
1,640

 Other comprehensive loss
1,634

 
197

 
(21,821
)
 
(19,990
)
Balance at June 30, 2018
$
(103,188
)
 
$
108

 
$
(105,883
)
 
$
(208,963
)