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Pension Plans and Other Postretirement Benefits (Details 7) $ in Thousands	12 Months Ended
	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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- Definition

Defined benefit plan and other post retirement plan expected contributions for the full next fiscal year as of the current fiscal year-end.

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