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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,
2021202020212020
Service cost$— $192 $— $262 
Interest cost551 675 65 73 
Expected return on plan assets(1,094)(970)(65)(70)
Amortization of net loss— — — 23 
Net periodic expense (benefit)$(543)$(103)$— $288 
U.S. Foreign 
Six months ended
June 30,		Six months ended
June 30,
2021202020212020
Service cost$— $384 $— $521 
Interest cost1,102 1,351 130 144 
Expected return on plan assets(2,187)(1,940)(130)(138)
Amortization of net loss— — — 46 
Net periodic (benefit) expense$(1,085)$(205)$— $573 
Other Postretirement Benefit Plans
Three months ended
June 30,		Six months ended
June 30,
2021202020212020
Interest cost4 5 8 10 
Amortization of prior service credit(58)(58)(116)(116)
Amortization of net loss2 — 3 — 
Net periodic benefit$(52)$(53)$(105)$(106)