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Benefit Plans | 6 Months Ended
--- | ---
Jun. 30, 2021
Retirement Benefits [Abstract] |
Benefit Plans | 16. Benefit Plans: The following information is provided for (1) the Company-sponsored defined benefit pension plans covering employees in the U.S. and certain employees at its foreign subsidiaries and (2) the Company-sponsored unfunded plans to provide certain health care benefits to retired employees in the U.S. Components of net periodic expense (benefit) are as follows: Defined Benefit Pension Plans
|  | U.S. |  | Foreign
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost |  | $ | — |  |  | $ | 192 |  |  | $ | — |  |  | $ | 262 |
Interest cost |  | 551 |  |  | 675 |  |  | 65 |  |  | 73 |
Expected return on plan assets |  | (1,094) |  |  | (970) |  |  | (65) |  |  | (70) |
Amortization of net loss |  | — |  |  | — |  |  | — |  |  | 23 |
Net periodic expense (benefit) |  | $ | (543) |  |  | $ | (103) |  |  | $ | — |  |  | $ | 288 |
|  | U.S. |  | Foreign
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost |  | $ | — |  |  | $ | 384 |  |  | $ | — |  |  | $ | 521 |
Interest cost |  | 1,102 |  |  | 1,351 |  |  | 130 |  |  | 144 |
Expected return on plan assets |  | (2,187) |  |  | (1,940) |  |  | (130) |  |  | (138) |
Amortization of net loss |  | — |  |  | — |  |  | — |  |  | 46 |
Net periodic (benefit) expense |  | $ | (1,085) |  |  | $ | (205) |  |  | $ | — |  |  | $ | 573 |
Other Postretirement Benefit Plans
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Interest cost |  | 4 |  |  | 5 |  |  | 8 |  |  | 10 |
Amortization of prior service credit |  | (58) |  |  | (58) |  |  | (116) |  |  | (116) |
Amortization of net loss |  | 2 |  |  | — |  |  | 3 |  |  | — |
Net periodic benefit |  | $ | (52) |  |  | $ | (53) |  |  | $ | (105) |  |  | $ | (106) |

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