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Post Retirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2020
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of expense for the Company's post-retirement benefit plans for the three and six months ended June 30, 2020 and 2019 are as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Pension expense: |  |  |  |  |  |  |
Multi-employer plan | $ | 145,000 |  |  | $ | 231,000 |  |  | $ | 391,000 |  |  | $ | 462,000 |
Defined contribution plan | 215,000 |  |  | 324,000 |  |  | 508,000 |  |  | 586,000 |
Total pension expense | 360,000 |  |  | 555,000 |  |  | 899,000 |  |  | 1,048,000 |
Health and life insurance: |  |  |  |  |  |  |
Interest cost | 59,000 |  |  | 72,000 |  |  | 118,000 |  |  | 144,000 |
Amortization of prior service costs | (124,000 | ) |  | (125,000 | ) |  | (248,000 | ) |  | (250,000 | )
Amortization of net loss | 45,000 |  |  | 29,000 |  |  | 90,000 |  |  | 58,000 |
Net periodic benefit cost | (20,000 | ) |  | (24,000 | ) |  | (40,000 | ) |  | (48,000 | )
Total post retirement benefits expense | $ | 340,000 |  |  | $ | 531,000 |  |  | $ | 859,000 |  |  | $ | 1,000,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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