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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total (in dollars per share) | $ 0.28 | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.26 | $ 0.26 | $ 0.26 | $ 1.09 | $ 1.05 | $ 1.16
Characterization Of Distributions For Federal Income Tax Purposes |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Qualified dividend (in dollars per share) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital gain (in dollars per share) |  |  |  |  |  |  |  |  | 0 | 0.23 | 0.39
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.87 | $ 1.05 | $ 1.16
Qualified dividend |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Capital gain |  |  |  |  |  |  |  |  | 0.00% | 22.00% | 34.00%
Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Characterization Of Distributions For Federal Income Tax Purposes | Non-Section 199A |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0 | $ 0.82 | $ 0.77
Ordinary income |  |  |  |  |  |  |  |  | 0.00% | 78.00% | 66.00%
Characterization Of Distributions For Federal Income Tax Purposes | Section 199A |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.87 | $ 0 | $ 0
Ordinary income |  |  |  |  |  |  |  |  | 100.00% | 0.00% | 0.00%

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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