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Operations and Summary of Significant Accounting Policies and Estimates Operations and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Note 1. Operations And Summary Of Significant Accounting Policies And Estimates [Abstract]  
Schedule of Changes in Doubtful Accounts [Table Text Block]
Changes in allowance for doubtful accounts are summarized as follows (in thousands):
 
 
Years Ended December 31,
 
 
2012
 
2011
 
2010
Balances at beginning of period
 
$
6,796

 
$
3,440

 
$
1,975

Additions - charged to expense
 
1,705

 
4,806

 
1,814

Deductions - write-offs, net of recoveries
 
(3,912
)
 
(1,450
)
 
(349
)
Balances at end of period
 
$
4,589

 
$
6,796

 
$
3,440