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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Pension Benefits |
Employee Benefit Plans [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The following are components of the net periodic benefit cost for the pension and postretirement benefit plans maintained by the Company for the three and nine months ended September 30, 2018 and 2017:
| Pension Benefits
(in thousands) | Three months ended September 30, |  | Nine months ended September 30,
2018 |  | 2017 |  | 2018 |  | 2017
Interest cost | $ | 33 |  |  | $ | 38 |  |  | $ | 98 |  |  | $ | 116 |
Recognized net actuarial loss | 61 |  |  | 63 |  |  | 183 |  |  | 189 |
Benefit cost | $ | 94 |  |  | $ | 101 |  |  | $ | 281 |  |  | $ | 305 |
Postretirement Benefits |
Employee Benefit Plans [Line Items] |
Schedule of Defined Benefit Plans Disclosures |
| Postretirement Benefits
(in thousands) | Three months ended September 30, |  | Nine months ended September 30,
2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 81 |  |  | $ | 81 |  |  | $ | 243 |  |  | $ | 310 |
Interest cost | 188 |  |  | 202 |  |  | 565 |  |  | 784 |
Amortization of prior service cost | (227 | ) |  | (228 | ) |  | (683 | ) |  | (228 | )
Benefit cost | $ | 42 |  |  | $ | 55 |  |  | $ | 125 |  |  | $ | 866 |

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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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