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Post Retirement Benefits (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Aug. 19, 2010 | Dec. 31, 2013 Plan | Dec. 31, 2014 Postretirement benefits | Dec. 31, 2013 Postretirement benefits | Dec. 31, 2012 Postretirement benefits | Dec. 31, 2010 Postretirement benefits
Postretirement benefits: |  |  |  |  |  |
Number of 401k plans |  | 3 |  |  |  |
Payments for post retirement benefits | $ 1,257 |  |  |  |  |
Decrease in post retirement obligations |  |  |  |  |  | 10,282
Amortization period |  |  |  |  |  | 20 years
Change in net periodic benefit cost due to plan amendment |  |  | 496 | 496 |  |
Actuarial gain (loss) |  |  |  | (2,917) | (792) |
Prior service credit not yet recognized |  |  |  | 7,109 | 4,487 |
Amounts that will be amortized from accumulated other comprehensive income in necxt fiscal year: |  |  |  |  |  |
Amortization of prior service credit |  |  | 496 |  |  |
Amortization of loss |  |  | 47 |  |  |
Amortization of interest expense |  |  | 277 |  |  |
Amounts that will be amortized in next fiscal year |  |  | 172 |  |  |
Assumed health care cost trend rates: |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  |  | 7.00% | 7.00% |
Ultimate health care cost trend rate |  |  |  | 5.00% | 5.00% |
Effect of changing the health care cost trend rate by one-percentage point for each future year: |  |  |  |  |  |
Effect on total of service and interest cost components, 1 - percentage point increase |  |  |  | 36 |  |
Effect on total of service and interest cost components, 1 - percentage point decrease |  |  |  | (50) |  |
Effect on post retirement benefit obligation, 1 - percentage point increase |  |  |  | 504 |  |
Effect on post retirement benefit obligation, 1 - percentage point decrease |  |  |  | $ (826) |  |

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- Definition Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year, Before Tax + References No definition available. + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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- Definition Disclosure under FAS 132R, before it was amended by FAS 158, of the portion of prior service costs and credits, due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + 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 (j) -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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- Definition The ultimate trend rate for health care 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 (l) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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