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Fair-Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Summary Of Valuation Of Financial Instruments At Fair-Value
 
June 30, 2013
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
380,245

 
$
64,092

 
$
316,153

 
$
—

 
December 31, 2012
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
378,266

 
$
70,488

 
$
307,778

 
$
—

Current marketable securities
3,200

 
—

 
3,200

 
—