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Fair-Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Summary Of Valuation Of Financial Instruments At Fair-Value
 
December 31, 2014
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
385,548

 
$
63,092

 
$
322,456

 
$
—

Marketable securities
$
8,285

 
$
—

 
$
8,285

 
$
—
 
December 31, 2013
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
441,199

 
$
99,092

 
$
342,107

 
$
—