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Pension Plans and Other Postretirement Benefits (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | $ 35,722 |  | $ 32,614 |
United States [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 14,730 | [1] | 13,199 | [1]
International [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 3,579 | [1] | 3,290 | [1]
Fixed Income Funds [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 17,413 |  | 16,125 |
Level 1 [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 |  | 0 |
Level 1 [Member] | United States [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 | [1] | 0 | [1]
Level 1 [Member] | International [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 | [1] | 0 | [1]
Level 1 [Member] | Fixed Income Funds [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 |  | 0 |
Level 2 [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 35,722 |  | 32,614 |
Level 2 [Member] | United States [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 14,730 | [1] | 13,199 | [1]
Level 2 [Member] | International [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 3,579 | [1] | 3,290 | [1]
Level 2 [Member] | Fixed Income Funds [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 17,413 |  | 16,125 |
Level 3 [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 |  | 0 |
Level 3 [Member] | United States [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 | [1] | 0 | [1]
Level 3 [Member] | International [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | 0 | [1] | 0 | [1]
Level 3 [Member] | Fixed Income Funds [Member] |  |  |  |
Fair value hierarchy for the Company's defined benefit pension plan assets |  |  |  |
Total | $ 0 |  | $ 0 |
[1] | None of the trust fund assets for the defined benefit pension plan have been invested in shares of HMEC’s common stock.

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- Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 + Details
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Period Type: | instant