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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
Changes in the carrying amount of goodwill for the three months ended March 31, 2017 are summarized as follows (dollars in thousands):
 
Packaging
 
Aerospace
 
Energy
 
Engineered Components
 
Total
Balance, December 31, 2016
$
162,090

 
$
146,430

 
$

 
$
6,560

 
$
315,080

Foreign currency translation and other
1,030

 

 

 

 
1,030

Balance, March 31, 2017
$
163,120

 
$
146,430

 
$

 
$
6,560

 
$
316,110


The Company amortizes its other intangible assets over periods ranging from one to 30 years. The gross carrying amounts and accumulated amortization of the Company's other intangibles as of March 31, 2017 and December 31, 2016 are summarized below (dollars in thousands):
 
 
As of March 31, 2017
 
As of December 31, 2016
Intangible Category by Useful Life
 
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
Finite-lived intangible assets:
 

 

 

 

   Customer relationships, 5 – 12 years
 
$
73,820

 
$
(35,200
)
 
$
73,570

 
$
(33,200
)
   Customer relationships, 15 – 25 years
 
132,230

 
(46,690
)
 
132,230

 
(44,970
)
Total customer relationships
 
206,050

 
(81,890
)
 
205,800

 
(78,170
)
   Technology and other, 1 – 15 years
 
57,490

 
(26,880
)
 
57,470

 
(26,040
)
   Technology and other, 17 – 30 years
 
43,300

 
(31,900
)
 
43,300

 
(31,370
)
Total technology and other
 
100,790

 
(58,780
)
 
100,770

 
(57,410
)
Indefinite-lived intangible assets:
 

 

 

 

 Trademark/Trade names
 
42,930

 

 
42,930

 

Total other intangible assets
 
$
349,770

 
$
(140,670
)
 
$
349,500

 
$
(135,580
)

Amortization expense related to intangible assets as included in the accompanying consolidated statement of income is summarized as follows (dollars in thousands):
 
 
Three months ended March 31,
 
 
2017
 
2016
Technology and other, included in cost of sales
 
$
1,350

 
$
1,380

Customer relationships, included in selling, general and administrative expenses
 
3,640

 
3,720

Total amortization expense
 
$
4,990

 
$
5,100