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Goodwill And Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule Of Changes In The Carrying Value Of Goodwill
The following tables represents the changes in the carrying value of goodwill and intangibles during three months ended March 31, 2017:
Goodwill
Balance as of December 31, 2016
$
171,117

   Adjustments
—

Balance as of March 31, 2017
$
171,117
Schedule Of Intangible Assets With Determinable Useful Lives By Major Category
Intangible Assets
 
As of December 31, 2016
 
As of March 31, 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

 
$
(3,811
)
 
$
18,689

Technological know-how
55,300

 
(10,397
)
 
44,903

 
55,300

 
(12,173
)
 
43,127

Customer –related
    intangible
64,500

 
(6,177
)
 
58,323

 
64,500

 
(7,295
)
 
57,205

Total finite-lived
    intangible assets
$
142,300

 
$
(19,809
)
 
$
122,491

 
$
142,300

 
$
(23,279
)
 
$
119,021