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Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Benefit Plans | 15. 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, (2) the Company-sponsored unfunded plans to provide certain health care benefits to retired employees in the U.S. and Canada, and (3) the Company’s defined benefit supplementary retirement plans which provide benefits for certain U.S. employees in excess of qualified plan limitations. Components of net periodic expense (benefit) are as follows: Defined Benefit Pension Plans
|  | U.S. |  | Foreign
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 310 |  |  | $ | 305 |  |  | $ | 887 |  |  | $ | 842 |
Interest cost |  | 2,372 |  |  | 2,536 |  |  | 1,505 |  |  | 1,431 |
Expected return on plan assets |  | (3,174 | ) |  | (3,061 | ) |  | (1,319 | ) |  | (1,294 | )
Amortization of net loss |  | — |  |  | — |  |  | 13 |  |  | — |
Net periodic expense (benefit) |  | $ | (492 | ) |  | $ | (220 | ) |  | $ | 1,086 |  |  | $ | 979 |
Supplemental Retirement Plans
|  | Three months ended March 31,
|  | 2018 |  | 2017
Interest cost |  | $ | 110 |  |  | $ | 123 |
Net periodic expense |  | $ | 110 |  |  | $ | 123 |
Other Postretirement Benefit Plans
|  | Three months ended March 31,
|  | 2018 |  | 2017
Service cost |  | $ | 6 |  |  | $ | 5 |
Interest cost |  | 38 |  |  | 40 |
Amortization of prior service credit |  | (19 | ) |  | (19 | )
Amortization of net gain |  | (11 | ) |  | (19 | )
Net periodic expense |  | $ | 14 |  |  | $ | 7 |

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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