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Note 4. Fair-Value Measurements (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
September 30, 2014
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
412,388

 
$
79,092

 
$
333,296

 
$

Marketable securities
$
3,285

 
$

 
$
3,285

 
$

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

 
$
99,092

 
$
342,107

 
$