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Goodwill And Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule Of Changes In The Carrying Value Of Goodwill
The following tables represent the changes in the carrying value of goodwill and intangibles for the nine months ended September 30, 2017:
Goodwill
Balance as of December 31, 2016
$
171,117

   Adjustments
—

Balance as of September 30, 2017
$
171,117
Schedule Of Intangible Assets With Determinable Useful Lives By Major Category
Intangible Assets
 
As of December 31, 2016
 
As of September 30, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization & Impairment
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization & Impairment
 
Net
Carrying
Amount
 
(Dollars in Thousands)
Trade name
$
22,500

 
$
(3,235
)
 
$
19,265

 
$
22,500

 
$
(4,954
)
 
$
17,546

Technological know-how
55,300

 
(10,397
)
 
44,903

 
55,300

 
(15,646
)
 
39,654

Customer –related
    intangible
64,500

 
(6,177
)
 
58,323

 
64,500

 
(9,527
)
 
54,973

Total finite-lived
    intangible assets
$
142,300

 
$
(19,809
)
 
$
122,491

 
$
142,300

 
$
(30,127
)
 
$
112,173