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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Dividends Declared [Table Text Block]
The Company declared the following dividends for the year ended December 31:
 
2017
 
2016
 
2015
Dividends paid per common share
$
1.43

 
$
1.37

 
$
1.32