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Income Taxes Income Taxes (Tables) | 12 Months Ended
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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 |

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- Definition Income Taxes [Abstract] + References No definition available. + Details
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- Definition This item represents a schedule of the amount of dividends paid during the period on a per share basis. + References No definition available. + Details
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