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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2013
Class of Stock Disclosures [Abstract]  
Schedule of Capital Units [Table Text Block]
Capital stock activity for 2013, 2012 and 2011 consisted of the following (in thousands of shares):
 
Common Stock
Shares
 
Class B
Shares
 
Treasury
Shares
January 1, 2011 Balance
33,559

 
1,086

 
(2,319
)
Exercise of stock options
180

 
—

 
—

Restricted stock awards
96

 
—

 
(31
)
Purchase of shares for treasury
—

 
—

 
(750
)
December 31, 2011 Balance
33,835

 
1,086

 
(3,100
)
Exercise of stock options
10

 
—

 
(8
)
Restricted stock awards
107

 
—

 
(27
)
December 31, 2012 Balance
33,952

 
1,086

 
(3,135
)
Exercise of stock options
30

 
—

 
—

Restricted stock awards
102

 
—

 
(23
)
December 31, 2013 Balance
34,084

 
1,086

 
(3,158
)