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Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Dec. 31, 2015
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, 2013
$
(105,675
)
 
$
(7,727
)
 
$
3,489

 
$
(109,913
)
Other comprehensive income before
    reclassifications
59,648

 
340

 
1,103

 
61,091

Amounts reclassified from accumulated
    other comprehensive loss
7,106

 
3,597

 

 
10,703

 Other comprehensive income
66,754

 
3,937

 
1,103

 
71,794

Balance at December 31, 2013
(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
)