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Income Taxes Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Income Taxes [Abstract]  
Schedule of Dividends Paid, Per Share [Table Text Block]
Dividend payments to common stockholders for the last three years are characterized for tax purposes as follows on a per share basis:
(Unaudited)
2019
 
2018
 
2017
Ordinary income
$
4.20000

 
$
3.33730

 
$
2.93054

Capital gain
—

 
—

 
0.20643

Return of capital
—

 
0.66270

 
0.66303

Dividends paid per common share
$
4.20

 
$
4.00

 
$
3.80