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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015
$
(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
)
Other comprehensive income before
    reclassifications
(8,486
)
 
(527
)
 
63,874

 
54,861

Amounts reclassified from accumulated
    other comprehensive loss
2,193

 
(86
)
 
—

 
2,107

 Other comprehensive income
(6,293
)
 
(613
)
 
63,874

 
56,968

Adoption of accounting standards update related to reclassification of certain tax effects
(15,424
)
 
(16
)
 
(6,645
)
 
(22,085
)
Balance at December 31, 2017
$
(104,822
)
 
$
(89
)
 
$
(84,062
)
 
$
(188,973
)