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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 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 income before reclassifications
—

 
(366
)
 
13,800

 
13,434

Amounts reclassified from accumulated other
    comprehensive loss
856

 
(24
)
 
—

 
832

 Other comprehensive income
856

 
(390
)
 
13,800

 
14,266

Balance at March 31, 2018
$
(103,966
)
 
$
(479
)
 
$
(70,262
)
 
$
(174,707
)