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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Capital Stock
Capital stock activity for 2019, 2018 and 2017 consisted of the following (in thousands of shares):
 
Common Stock
Shares
 
Class B
Shares
 
Treasury
Shares
January 1, 2017 Balance
35,318

 
729

 
(3,616
)
Conversion of Class B to Common
723

 
(723
)
 
—

Exercise of stock options
193

 
—

 
(4
)
Restricted stock awards
298

 
—

 
(81
)
December 31, 2017 Balance
36,532

 
6

 
(3,701
)
Exercise of stock options
185

 
—

 
(50
)
Restricted stock awards
293

 
—

 
(90
)
December 31, 2018 Balance
37,010

 
6

 
(3,841
)
Restricted and performance stock awards
599

 
—

 
(112
)
December 31, 2019
37,609

 
6

 
(3,953
)