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Income Taxes Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Taxes [Abstract]  
Schedule of Dividends Paid, Per Share [Table Text Block]
Per share dividend payments to common stockholders for the last three years are characterized for tax purposes as follows:
(Unaudited)
2017
 
2016
 
2015
Ordinary income
$
2.93054

 
$
2.67863

 
$
2.62808

Capital gain
0.20643

 
0.92137

 
0.69110

Return of capital
0.66303

 
—

 
0.08082

Dividends paid per common share
$
3.80

 
$
3.60

 
$
3.40