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Equity and Capital Equity and Capital Tax Status of Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax Status of Dividends [Abstract] |  |  |
Common stock/unit per share | $ 2.00 | $ 1.94 | $ 1.88
Allocation of Dividends, Ordinary Income | 53.00% | 71.00% | 70.00%
Allocation of Dividends, Capital Gain | 8.00% | 5.00% | 16.00%
Allocation of Dividends, Return of Capital | 39.00% | 19.00% | 14.00%
Allocation of Dividends, Qualified Dividend Income | 0.00% | 5.00% | 0.00%

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://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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