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Equity - Non-controlling Interest (Details) - shares			1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Jan. 08, 2017	Jan. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
The Company
Class of Stock [Line Items]
Economic interests percentage				37.70%	38.85%
The Company | NuDevco Retail and Retailco
Class of Stock [Line Items]
Economic interests percentage				62.30%	61.15%
Retailco | Common Class B
Class of Stock [Line Items]
Number of shares from conversion (shares)			134,731
Censtar Convertible Debt | Common Class B
Class of Stock [Line Items]
Number of shares from conversion (shares)	383,090	134,731	383,090

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+ References

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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