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Note 4. Fair-Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
June 30, 2015
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
369,874

 
$
77,092

 
$
292,782

 
$
—

Marketable securities
$
8,285

 
$
—

 
$
8,285

 
$
—

 
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

 
$
—