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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2016
$
(83,105
)
 
$
540

 
$
(141,291
)
 
$
(223,856
)
Other comprehensive income before reclassifications
—

 
(283
)
 
7,457

 
7,174

Amounts reclassified from accumulated other
    comprehensive loss
629

 
(57
)
 
—

 
572

 Other comprehensive income
629

 
(340
)
 
7,457

 
7,746

Balance at March 31, 2017
$
(82,476
)
 
$
200

 
$
(133,834
)
 
$
(216,110
)