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Post Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Components of multiemployer plans |
Pension Fund |  | EIN/Pension Plan Number |  | Pension Protection Act Zone Status |  | FIP/RP Status Pending/ Implemented |  | Contributions of the Company |  | Surcharge Imposed |  | Expiration Date of Collective Bargaining Agreement
|  | 2015 |  | 2014 |  |  | 2015 |  | 2014 |  |
IAM National Pension Fund / National Pension Plan (A) |  | 51-6031295 - 002 |  | Green as of 12/31/14 |  | Green as of 12/31/13 |  | No |  | $863,000 |  | $719,000 |  | No |  | 8/17/2016
|  |  |  |  |  | Total Contributions: |  | $863,000 |  | $719,000 |  |  |  |
(A) The National Pension Plan utilized a five year amortization extension in accordance with § 431(d) of the Internal Revenue Code of 1986 ("the Code") to amortize its losses from 2008. The plan re-certified its zone status after using the amortization provisions of the Code. The Company's contributions to the plan did not represent more than 5% of total contributions to the plan as indicated in the plan's most recently available annual report for the plan year ended December 31, 2014. Under the terms of the collective-bargaining agreement, the Company is required to make contributions to the plan for each hour worked up to a maximum of 40 hours per person, per week, at the following rates: $1.25 per hour from August 13, 2012 through August 10, 2013; $1.30 per hour from August 11, 2013 through August 10, 2014; $1.35 per hour from August 11, 2014 through August 9, 2015; and $1.40 per hour from August 10, 2015 through August 17, 2016.
Reconciliation of changes in benefit obligation, amounts included in AOCI and assumptions used | The funded status of the Company's post retirement health and life insurance benefits plan as of December 31, 2015 and 2014 and reconciliation with the amounts recognized in the consolidated balance sheets are provided below.
| Post Retirement Benefits
| 2015 |  | 2014
Change in benefit obligation: |  |  |
Benefit obligation at January 1 | $ | 9,172,000 |  |  | $ | 6,774,000 |
Interest cost | 316,000 |  |  | 277,000 |
Unrecognized (gain) loss | (48,000 | ) |  | 2,726,000 |
Benefits paid | (434,000 | ) |  | (605,000 | )
Benefit obligation at December 31 | $ | 9,006,000 |  |  | $ | 9,172,000 |
Plan Assets | — |  |  | — |
Amounts recorded in accumulated other comprehensive income: |  |  |
Prior service credit | $ | (7,594,000 | ) |  | $ | (8,090,000 | )
Net loss | 3,939,000 |  |  | 4,156,000 |
Total | $ | (3,655,000 | ) |  | $ | (3,934,000 | )
Weighted-average assumptions as of December 31: |  |  |
Discount rate used to determine benefit obligation and net periodic benefit cost | 4.1 | % |  | 3.8 | %
Components of postretirement expense | The components of expense for all of the Company's post retirement benefit plans for the years ended December 31:
| 2015 |  | 2014 |  | 2013
Pension expense: |  |  |  |  |
Multi-employer plan | $ | 863,000 |  |  | $ | 719,000 |  |  | $ | 464,000 |
Defined contribution plans | 836,000 |  |  | 701,000 |  |  | 571,000 |
Total pension expense | 1,699,000 |  |  | 1,420,000 |  |  | 1,035,000 |
Health and life insurance: |  |  |  |  |
Interest cost | 316,000 |  |  | 277,000 |  |  | 332,000 |
Amortization of prior service costs | (496,000 | ) |  | (496,000 | ) |  | (496,000 | )
Amortization of net loss | 169,000 |  |  | 47,000 |  |  | 201,000 |
Net periodic benefit cost | (11,000 | ) |  | (172,000 | ) |  | 37,000 |
Total post retirement benefits expense | $ | 1,688,000 |  |  | $ | 1,248,000 |  |  | $ | 1,072,000 |
Effect of changing health care cost trend rate | The effect of changing the health care cost trend rate by one-percentage point for each future year is as follows:
| 1- Percentage Point Increase |  | 1-Percentage Point Decrease
Effect on total of service and interest cost components | $ | 40,000 |  |  | $ | (47,000 | )
Effect on post retirement benefit obligation | $ | 1,028,000 |  |  | $ | (1,227,000 | )
Estimated future benefit payments | The estimated future benefit payments of the health care plan are as follows:
Year | Postretirement Health Care Benefits Plan
2016 | $ | 1,060,000 |
2017 | 392,000 |
2018 | 370,000 |
2019 | 368,000 |
2020 | 381,000 |
2021-2025 | 2,144,000 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the 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 and 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=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947 + Details
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