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Postretirement Benefits (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Office space | $ 200,000 | $ 200,000 |  |
Increase in per capita health care cost rate |  | 7.80% |  |
Health care claims annual rate after 2024 |  | 4.50% |  |
Accumulated postretirement benefit obligation discount rate |  | 4.50% | 6.10% |
Net periodic benefit cost discount rate |  | 5.25% | 6.10% | 6.29%
Number of former officers of summit |  | 2 |  |
Defined benefit plan effect of 1% increase (decrease) on service and interest cost components |  | 0 |  |
Increase or decrease accumulated postretirement benefit obligation |  | 100,000 |  |
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to medical benefit |  | 1,260 |  |
Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to medical benefit |  | $ 540 |  |
Net Periodic Postretirement Benefit Costs [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase or decrease in health care cost trend rates |  | 1.00% |  |
Accumulated Postretirement Benefit Obligation [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase or decrease in health care cost trend rates |  | 1.00% |  |

X
- Definition The effect of a one-percentage-point increase or decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References No definition available. + Details
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- Definition Increase (decrease) in assumed health care cost trend rates for disclosure of potential significant effect on net periodic postretirement benefit costs or accumulated postretirement benefit obligation. + References No definition available. + Details
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- Definition The effect of a one-percentage-point increase or decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References No definition available. + Details
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- Definition Range of amounts of our (the employer) contribution to post retirement medical benefits per participant and their dependents. + References No definition available. + Details
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- Definition Number of former officers of Summit who are currently receiving postretirement benefits which include medical benefits and office space. + References No definition available. + Details
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- Definition As part of our agreement for postretirement benefits, we are providing a benefit of office space. This amount represents the current amount contributed in the reporting period. The expected amount to be paid is included in our postretirement benefit obligation. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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