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Post Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [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
|  | 2018 |  | 2017 |  |  | 2018 |  | 2017 |  |
IAM National Pension Fund / National Pension Plan (A) |  | 51-6031295 - 002 |  | Green as of 12/31/17 |  | Green as of 12/31/16 |  | No |  | $760,000 |  | $647,000 |  | No |  | 8/10/2019
|  |  |  |  |  | Total Contributions: |  | $760,000 |  | $647,000 |  |  |  |
(A) 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, 2017. 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: $1.45 per hour from August 8, 2016 through August 6, 2017; $1.50 per hour from August 7, 2017 through August 5, 2018; $1.55 per hour from August 6, 2018 through August 10, 2019.
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, 2018 and 2017 and reconciliation with the amounts recognized in the consolidated balance sheets are provided below.
| Post Retirement Benefits
| 2018 |  | 2017
Change in benefit obligation: |  |  |
Benefit obligation at January 1 | $ | 9,050,000 |  |  | $ | 8,667,000 |
Interest cost | 277,000 |  |  | 298,000 |
Unrecognized loss (gain) | (910,000 | ) |  | 417,000 |
Benefits paid, net | (341,000 | ) |  | (332,000 | )
Benefit obligation at December 31 | $ | 8,076,000 |  |  | $ | 9,050,000 |
Plan Assets | — |  |  | — |
Amounts recorded in accumulated other comprehensive income: |  |  |
Prior service credit | $ | (6,106,000 | ) |  | $ | (6,602,000 | )
Net loss | 2,652,000 |  |  | 3,733,000 |
Total | $ | (3,454,000 | ) |  | $ | (2,869,000 | )
Weighted-average assumptions as of December 31: |  |  |
Discount rate used to determine benefit obligation and net periodic benefit cost | 4.0 | % |  | 3.4 | %
Components of postretirement expense | The components of expense for all of the Company's post retirement benefit plans for the years ended December 31:
| 2018 |  | 2017 |  | 2016
Pension expense: |  |  |  |  |
Multi-employer plan | $ | 760,000 |  |  | $ | 647,000 |  |  | $ | 710,000 |
Defined contribution plans | 1,059,000 |  |  | 752,000 |  |  | 766,000 |
Total pension expense | 1,819,000 |  |  | 1,399,000 |  |  | 1,476,000 |
Health and life insurance: |  |  |  |  |
Interest cost | 277,000 |  |  | 298,000 |  |  | 323,000 |
Amortization of prior service costs | (496,000 | ) |  | (496,000 | ) |  | (496,000 | )
Amortization of net loss | 171,000 |  |  | 149,000 |  |  | 155,000 |
Net periodic benefit cost | (48,000 | ) |  | (49,000 | ) |  | (18,000 | )
Total post retirement benefits expense | $ | 1,771,000 |  |  | $ | 1,350,000 |  |  | $ | 1,458,000 |
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 | $ | 43,000 |  |  | $ | (36,000 | )
Effect on post retirement benefit obligation | $ | 962,000 |  |  | $ | (824,000 | )
Estimated future benefit payments | The estimated future benefit payments of the health care plan for the next ten years are as follows:
Year | Postretirement Health Care Benefits Plan
2019 | $ | 1,157,000 |
2020 | 440,000 |
2021 | 471,000 |
2022 | 487,000 |
2023 | 505,000 |
2024-2028 | 2,376,000 |

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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=82843861&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=82843861&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=82843861&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=77993564&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=82843861&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=82843861&loc=d3e1928-114920 + Details
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