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Components of Net Periodic Benefit Cost (Tables) | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Benefit Cost (Increase) | Net periodic benefit (increase) cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2017 and 2016 includes the following components (in thousands):
|  | Three months ended March 31,
|  | Pension benefits |  | Other post- retirement benefits
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | — |  |  | — |  |  | 26 |  |  | 38 |
Interest cost |  | 307 |  |  | 312 |  |  | 218 |  |  | 284 |
Expected return on plan assets |  | (638 | ) |  | (612 | ) |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |
Amortization of the net loss (gain) |  | 230 |  |  | 236 |  |  | (169 | ) |  | — |
Net periodic benefit (increase) cost |  | $ | (101 | ) |  | (64 | ) |  | 75 |  |  | 322 |

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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=65897934&loc=d3e1928-114920 + Details
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