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Dividends (Tables)
 12 Months Ended
Dec. 31, 2017
Dividends [Abstract]  
Dividends Declared [Table Text Block]
Interim dividends declared on Class A common stock and redeemable preferred stock for each quarter of the respective years ended December 31 were as follows:
 
 
 
2017
 
2016
 
2015
 
First Quarter
 
$
0.075
 
$
0.075
 
$
0.075
 
Second Quarter
 
 
0.075
 
 
0.075
 
 
0.075
 
Third Quarter
 
 
0.075
 
 
0.075
 
 
0.075
 
Fourth Quarter
 
 
0.085
 
 
0.075
 
 
0.075
 
 
 
$
0.31
 
$
0.30
 
$
0.30