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Income Taxes - Tax Status of Dividends (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Tax Status of Dividends [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Ordinary income | 98.00% | 86.00% | 53.00%
Capital gain | 0.00% | 10.00% | 8.00%
Return of capital | 0.00% | 4.00% | 39.00%
Allocation of Dividends, Qualified Dividend Income | 2.00% | 0.00% | 0.00%
Allocation of Dividends, Section 199A Dividend | 98.00% | 0.00% | 0.00%
Parent Company [Member] |  |  |
Schedule of Tax Status of Dividends [Line Items] |  |  |
Dividend per share | $ 2.22 | $ 2.10 | $ 2.00

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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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