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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 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
—

 
(400
)
 
37,934

 
37,534

Amounts reclassified from accumulated other
    comprehensive loss
1,258

 
(75
)
 
—

 
1,183

 Other comprehensive income
1,258

 
(475
)
 
37,934

 
38,717

Balance at June 30, 2017
$
(81,847
)
 
$
65

 
$
(103,357
)
 
$
(185,139
)