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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Amounts Included in Accumulated Other Comprehensive Income (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 January 1, 2014
$
(38,921
)
 
$
(3,790
)
 
$
4,592

 
$
(38,119
)
Other comprehensive loss before
    reclassifications
(49,602
)
 
(923
)
 
(79,766
)
 
(130,291
)
Amounts reclassified from accumulated
    other comprehensive loss
(729
)
 
3,515

 
—

 
2,786

 Other comprehensive loss
(50,331
)
 
2,592

 
(79,766
)
 
(127,505
)
Balance at December 31, 2014
(89,252
)
 
(1,198
)
 
(75,174
)
 
(165,624
)
Other comprehensive loss before
    reclassifications
2,851

 
(1,410
)
 
(48,364
)
 
(46,923
)
Amounts reclassified from accumulated
    other comprehensive loss
2,121

 
1,620

 
—

 
3,741

 Other comprehensive loss
4,972

 
210

 
(48,364
)
 
(43,182
)
Balance at December 31, 2015
(84,280
)
 
(988
)
 
(123,538
)
 
(208,806
)
Other comprehensive loss before
    reclassifications
(1,991
)
 
441

 
(17,753
)
 
(19,303
)
Amounts reclassified from accumulated
    other comprehensive loss
3,166

 
1,087

 
—

 
4,253

 Other comprehensive loss
1,175

 
1,528

 
(17,753
)
 
(15,050
)
Balance at December 31, 2016
$
(83,105
)
 
$
540

 
$
(141,291
)
 
$
(223,856
)