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Subsequent Events (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 2 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 16, 2017 $ / shares | Jan. 31, 2017 shares | Jan. 19, 2017 $ / shares | Jan. 08, 2017 shares | Oct. 05, 2016 shares | Mar. 02, 2017 USD ($) kWh
Common Class A | Scenario, Forecast |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends paid (in dollars per share) | $ / shares | $ 0.3625 |  |  |  |  |
Common Class A | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ / shares |  |  | $ 0.3625 |  |  |
Common Class B | CenStar Note |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  |  |  |  | 134,731 |
Common Class B | CenStar Note | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  |  |  | 134,731 |  |
Common Class B | Oasis Note | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  | 383,090 |  |  |  |
National Gas & Electric, LLC | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
RCEs | kWh |  |  |  |  |  | 190,000,000,000
Payments to acquire RCEs | $ |  |  |  |  |  | $ 2.2
National Gas & Electric, LLC | Subsequent Event | Scenario, Forecast |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
RCEs | kWh |  |  |  |  |  | 410,000,000,000

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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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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