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Stockholders' Equity Common Equity (Details) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 20, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Class of Stock [Line Items] |  |  |  |  |
Dividends Per Common Share Declared for the Period |  | $ 0.125 | $ 0.490 | $ 0.250 | $ 0.970
Class P |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends Per Common Share Declared for the Period |  | 0.125 | 0.49 | 0.250 | 0.97
Per common share cash dividend paid in the period |  | $ 0.125 | $ 0.48 | $ 0.250 | $ 0.93
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends Per Common Share Declared for the Period | $ 0.125 |  |  |  |

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- Definition Aggregate dividends paid 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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