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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2015
$
(84,280
)
 
$
(988
)
 
$
(123,538
)
 
$
(208,806
)
Other comprehensive income before reclassifications
—

 
(516
)
 
10,492

 
9,976

Amounts reclassified from accumulated other
    comprehensive loss
913

 
461

 
—

 
1,374

 Other comprehensive income
913

 
(55
)
 
10,492

 
11,350

Balance at March 31, 2016
$
(83,367
)
 
$
(1,043
)
 
$
(113,046
)
 
$
(197,456
)