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Note 7. Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
March 31,
   
Pension Benefits
 
Other Benefits
   
2012
 
2011
 
2012
 
2011
Service cost
 
$
993
   
$
969
   
$
17
   
$
14
 
Interest cost
 
1,017
   
1,028
   
19
   
19
 
Expected return on plan assets
 
(1,145
)
 
(1,370
)
 
—
   
—
 
Amortization of prior service cost
 
100
   
101
   
11
   
11
 
Amortization of net (gain) loss
 
707
   
220
   
(7
)
 
(11
)
Net periodic benefit cost
 
$
1,672
   
$
948
   
$
40
   
$
33