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Retirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Cost | The following tables present the components of net periodic benefit cost (gains are denoted with parentheses and losses are not):
| Nine Months Ended September 30, 2015
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Service cost |  | $ | 6 |  |  |  | $ | 3 |  |  |  | $ | 9 |
Interest cost |  | 303 |  |  |  | 651 |  |  |  | 954 |
Expected return on plan assets |  | (495 | ) |  |  | (921 | ) |  |  | (1,416 | )
Amortization of prior service cost |  | — |  |  |  | — |  |  |  | — |
Amortization of net loss |  | 186 |  |  |  | 300 |  |  |  | 486 |
Net periodic benefit cost |  | $ | — |  |  |  | $ | 33 |  |  |  | $ | 33 |
| Nine Months Ended September 30, 2014
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Service cost |  | $ | 6 |  |  |  | $ | 3 |  |  |  | $ | 9 |
Interest cost |  | 315 |  |  |  | 639 |  |  |  | 954 |
Expected return on plan assets |  | (477 | ) |  |  | (885 | ) |  |  | (1,362 | )
Amortization of prior service cost |  | — |  |  |  | — |  |  |  | — |
Amortization of net loss |  | 54 |  |  |  | 45 |  |  |  | 99 |
Net periodic benefit income |  | $ | (102 | ) |  |  | $ | (198 | ) |  |  | $ | (300 | )

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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=58740216&loc=d3e1928-114920 + Details
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