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Pension Plans and Other Postretirement Benefits (Details 6) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accumulated postretirement benefit obligations and Service and interest cost components of the net periodic postretirement benefit expense |  |  |  |  |  |
Accumulated postretirement benefit obligations effect of a one percentage point increase effect of a one percentage point increase | $ 0 |  | $ 45 |  | $ 53 |
Accumulated postretirement benefit obligations effect of a one percentage point increase effect of a one percentage point decrease | 0 |  | (43) |  | (50) |
Service and interest cost components of the net periodic postretirement benefit expense effect of a one percentage point increase | 2 |  | 1 |  | 2 |
Service and interest cost components of the net periodic postretirement benefit expense effect of a one percentage point decrease | $ (2) |  | $ (1) |  | $ (1) |
Weighted-average assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |
Discount rate | 4.46% |  | 3.51% |  | 2.95% |
Healthcare cost trend rate |  | [1] | 7.50% |  | 8.00% |
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) |  | [1] | 5.00% |  | 5.00% |
Year the rate is assumed to reach the ultimate trend rate |  |  | 2022 |  | 2022 |
Expected return on plan assets |  | [1] |  | [1] |  | [1]
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |  |  |  |
Discount rate | 3.51% |  | 2.95% |  | 3.68% |
Healthcare cost trend rate | 7.50% |  | 8.00% |  | 8.00% |
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) | 5.00% |  | 5.00% |  | 5.00% |
Year the rate is assumed to reach the ultimate trend rate | 2022 |  | 2022 |  | 2021 |
Expected return on plan assets |  | [1] |  | [1] |  | [1]
[1] | Not applicable.

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- Definition Defined benefit plan health care benefit obligations trend rate assumed for next fiscal year. + References No definition available. + Details
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- Definition Defined benefit plan ultimate health care benefit obligations trend rate. + References No definition available. + Details
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- Definition Defined benefit plan year benefit obligations that rate reaches ultimate trend rate. + 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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: 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=28361610&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 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)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + 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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 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 + Details
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