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Changes in Capital Structure Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Changes in Capital Structure [Abstract]  
Dividends Declared [Table Text Block]
The following table lists the dividends paid on the Company's Class A common stock and Class C common stock during the nine months ended September 30, 2018:
 
Third Quarter 2018
 
Second Quarter 2018
 
First Quarter 2018
Dividends per Class A share
$
0.320

 
$
0.309

 
$
0.298

Dividends per Class C share
$
0.320

 
$
0.309

 
$
0.298