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Pension Plans and Other Postretirement Benefits (Details 7) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Defined Benefit Plan [Member] |  |
Minimum funding requirement for 2017 | $ 0 |
Expected contributions (approximations) for the year ended December 31, 2017 as of the time of this Form 10-K | 0 | [1]
Supplemental Defined Benefit Plans [Member] |  |
Minimum funding requirement for 2017 | 0 |
Expected contributions (approximations) for the year ended December 31, 2017 as of the time of this Form 10-K | $ 1,318 | [1]
[1] | HMEC’s Annual Report on Form 10-K for the year ended December 31, 2016.

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