| Component: (Network and Table) | |
|---|---|
| Network | 139 - Disclosure - Asset Retirement Obligations (Tables) (http://www.ewst.com/role/AssetRetirementObligationsTables) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000043350 (http://www.sec.gov/CIK) |
| Asset Retirement Obligation Disclosure [Abstract] | Period [Axis] | |||||||||||||||||||||||||||||||||||||||||||||||||
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2016-01-01 - 2016-12-31 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Asset Retirement Obligation Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of Change in Asset Retirement Obligation | The following schedule presents our recognized asset retirement obligations, included in other long-term liabilities in our Consolidated Balance Sheets as of December 31, 2016 and 2015.
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