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Pensions and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Periodic Benefit Plan Cost | The composition of the net periodic benefit plan cost for the six months ended June 30, 2016 and 2015 was as follows:
|  | Pension plans |  | Other postretirement benefits
(in thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Components of net periodic benefit cost: |  |  |  |  |  |
Service cost |  | $1,319 |  |  | $1,529 |  |  | $127 |  |  | $166 |
Interest cost |  | 4,049 |  |  | 3,895 |  |  | 1,221 |  |  | 1,220 |
Expected return on assets |  | (4,482 | ) |  | (4,326 | ) |  | - |  |  | - |
Amortization of prior service cost/(credit) |  | 19 |  |  | 24 |  |  | (2,244 | ) |  | (2,244 | )
Amortization of net actuarial loss |  | 1,164 |  |  | 1,297 |  |  | 1,410 |  |  | 1,669 |
Net periodic benefit cost |  | $2,069 |  |  | $2,419 |  |  | $514 |  |  | $811 |

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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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