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Employee Benefit Plan (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Schedule of net periodic benefit cost and other comprehensive income | Components of Net Periodic Benefit Cost
| Pension Benefits Three Months Ended |  | Life and Health Three Months Ended |  | SERP Benefits Three Months Ended
(in thousands) | 6/30/2018 |  |  | 6/30/2017 |  |  | 6/30/2018 |  |  | 6/30/2017 |  |  | 6/30/2018 |  |  | 6/30/2017 |
Service cost | $ | 0 |  |  | $ | 0 |  |  | $ | 53 |  |  | $ | 28 |  |  | $ | 35 |  |  | $ | 29 |
Interest cost | 663 |  |  | 643 |  |  | 71 |  |  | 62 |  |  | 211 |  |  | 217 |
Expected return on plan assets | (1,406 | ) |  | (1,256 | ) |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |
Amortization of net retirement plan actuarial loss | 292 |  |  | 286 |  |  | 16 |  |  | 13 |  |  | 135 |  |  | 98 |
Amortization of net retirement plan prior service (credit) cost | (3 | ) |  | (3 | ) |  | (15 | ) |  | (35 | ) |  | 22 |  |  | 22 |
Net periodic benefit (income) cost | $ | (454 | ) |  | $ | (330 | ) |  | $ | 125 |  |  | $ | 68 |  |  | $ | 403 |  |  | $ | 366 |
Components of Net Periodic Benefit Cost
| Pension Benefits Six Months Ended |  | Life and Health Six Months Ended |  | SERP Benefits Six Months Ended
(in thousands) | 6/30/2018 |  |  | 6/30/2017 |  |  | 6/30/2018 |  |  | 6/30/2017 |  |  | 6/30/2018 |  |  | 6/30/2017 |
Service cost | $ | 0 |  |  | $ | 0 |  |  | $ | 106 |  |  | $ | 96 |  |  | $ | 80 |  |  | $ | 83 |
Interest cost | 1,254 |  |  | 1,250 |  |  | 135 |  |  | 134 |  |  | 417 |  |  | 426 |
Expected return on plan assets | (2,824 | ) |  | (2,523 | ) |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |
Amortization of net retirement plan actuarial loss | 559 |  |  | 537 |  |  | 31 |  |  | 17 |  |  | 270 |  |  | 199 |
Amortization of net retirement plan prior service cost (credit) | (5 | ) |  | (5 | ) |  | (31 | ) |  | (31 | ) |  | 44 |  |  | 44 |
Net periodic benefit (income) cost | $ | (1,016 | ) |  | $ | (741 | ) |  | $ | 241 |  |  | $ | 216 |  |  | $ | 811 |  |  | $ | 752 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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