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Pension and Postretirement Benefits Other Than Pension Plans | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and Postretirement Benefits Other Than Pension Plans | 9. PENSION AND POSTRETIREMENT BENEFITS OTHER THAN PENSION PLANS: Net periodic pension expense reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Interest cost |  | $ | 901 |  |  | $ | 953 |  |  | $ | 1,815 |  |  | $ | 1,930 |
Expected return on plan assets |  |  | (1,011 | ) |  |  | (1,006 | ) |  |  | (2,047 | ) |  |  | (2,040 | )
Amortization of net actuarial loss |  |  | 297 |  |  |  | 322 |  |  |  | 579 |  |  |  | 614 |
Total net periodic pension expense |  | $ | 187 |  |  | $ | 269 |  |  | $ | 347 |  |  | $ | 504 |
Net postretirement benefit income reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Interest cost |  | $ | 28 |  |  | $ | 30 |  |  | $ | 54 |  |  | $ | 60 |
Amortization of net actuarial loss |  |  | 66 |  |  |  | 62 |  |  |  | 123 |  |  |  | 121 |
Amortization of prior service credit |  |  | (329 | ) |  |  | (329 | ) |  |  | (657 | ) |  |  | (657 | )
Total net postretirement benefit income |  | $ | (235 | ) |  | $ | (237 | ) |  | $ | (480 | ) |  | $ | (476 | )

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