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Federal Income Taxes - Tax Status of Dividends (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.82 | $ 0.77 | $ 0.83
Qualified dividend (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.00
Capital gain (in dollars per share) |  |  |  |  |  |  |  |  | 0.23 | 0.39 | 0.39
Total (in dollars per share) | $ 0.27 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.41 | $ 0.25 | $ 0.25 | $ 0.25 | $ 1.05 | $ 1.16 | $ 1.22
Ordinary income |  |  |  |  |  |  |  |  | 78.00% | 66.00% | 68.00%
Qualified dividend |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Capital gain |  |  |  |  |  |  |  |  | 22.00% | 34.00% | 32.00%
Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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