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Note 4. Fair-Value Measurements (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
March 31, 2014
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
343,499

 
$
58,092

 
$
285,407

 
$

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

 
$
99,092

 
$
342,107

 
$