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Income Taxes - Schedule of Common Stock Distribution (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2016
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | $ 1.48 | $ 8.265 | $ 2.26 |
Common dividends, per share (in dollars per share) | 1.48 | 2.095 | 2.260 |
Ordinary dividends |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | 1.48 | 1.5561 | 2.1184 |
Capital gain dividends |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | 0 | 0 | 0.0316 |
Nondividend distributions |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | $ 0 | 6.7089 | $ 0.11 |
Nondividend distributions | Spinoff |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share |  | $ 6.17 |  | $ 6.17

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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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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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