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v3.6.0.2

Debt (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt |  |  |
Repayments of Lines of Credit | $ 0 | $ 38,000,000 | $ 0
Redemption of Senior Notes due 2016 | 0 | 127,292,000 | $ 0
Redemption Of Senior Notes Pretax Charge | $ 2,338,000 |  |
Current Unsecured Bank Credit Facility [Member] |  |  |
Debt |  |  |
Line of Credit Facility, Expiration Date | Jul. 30, 2019 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000 |  |
Variable Commitment Fee Charge On Unused Portion Of Credit Facility | 0.15% |  |
Debt Instrument, Basis Spread on Variable Rate | 1.15% |  |
Senior Notes 2015 [Member] |  |  |
Debt |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |
Debt Instrument, Maturity Date | Jun. 15, 2015 |  |
HMEC's Bank Credit Facility [Member] |  |  |
Debt |  |  |
Line of Credit Facility, Expiration Date | Oct. 06, 2015 |  |
Repayments of Lines of Credit | $ 113,000 |  |
Senior Notes 2025 [Member] |  |  |
Debt |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
Senior Note 6.05 % [Member] | Senior Notes 2015 [Member] |  |  |
Debt |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.05% |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |
Debt Instrument, Maturity Date | Jun. 15, 2015 |  |
Senior Note 6.85 % [Member] | Senior Notes 2016 [Member] |  |  |
Debt |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.85% |  |
Debt Instrument, Face Amount | $ 125,000,000 |  |
Debt Instrument, Repurchase Date | Dec. 23, 2015 |  |
Senior Note 6.85 % [Member] | Senior Notes 2025 [Member] |  |  |
Debt |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
Senior Note 4.50 % [Member] | Senior Notes 2025 [Member] |  |  |
Debt |  |  |
Debt Instrument, Unamortized Discount | $ 603,000 | 654,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
Debt Instrument, Face Amount | $ 250,000,000 |  |
Debt Instrument, Maturity Date | Dec. 01, 2025 |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.533% |  |
Debt Instrument Percentage Of Discount On Issuance | 0.265% |  |
Unamortized Debt Issuance Expense | $ 2,188,000 | $ 2,371,000 |

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- References No definition available. + Details
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- Definition The amount of redemption of senior notes results in pretax charge. + References No definition available. + Details
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- Definition Variable commitment fee percentage charged on unused portion of bank credit facility. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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