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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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Payments to Acquire Residential Customer Equivalents

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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

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+ 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)
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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Name Accounting Standards Codification
-Topic 230
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-Section 50
-Paragraph 3
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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.

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