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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans 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 six months ended June 30, 2018 and 2017:
| Pension Benefits
(in thousands) | Three months ended June 30, |  | Six months ended June 30,
2018 |  | 2017 |  | 2018 |  | 2017
Interest cost | $ | 32 |  |  | $ | 39 |  |  | $ | 65 |  |  | $ | 78 |
Recognized net actuarial loss | 61 |  |  | 63 |  |  | 122 |  |  | 126 |
Benefit cost | $ | 93 |  |  | $ | 102 |  |  | $ | 187 |  |  | $ | 204 |
| Postretirement Benefits
(in thousands) | Three months ended June 30, |  | Six months ended June 30,
2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 75 |  |  | $ | 106 |  |  | $ | 162 |  |  | $ | 229 |
Interest cost | 190 |  |  | 282 |  |  | 377 |  |  | 582 |
Amortization of prior service cost | (228 | ) |  | — |  |  | (456 | ) |  | — |
Benefit cost | $ | 37 |  |  | $ | 388 |  |  | $ | 83 |  |  | $ | 811 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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