RETIREMENT AND DEFERRED COMPENSATION PLANS

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

RETIREMENT AND DEFERRED COMPENSATION PLANS

RETIREMENT AND DEFERRED COMPENSATION PLANS

Components of Net Periodic Benefit Cost:

​	Domestic Plans				Foreign Plans
Three Months Ended September 30,	2020		2019		2020		2019
Service cost	$	3,570	$	2,772	$	1,867	$	1,429
Interest cost	1,761		1,845		360		491
Expected return on plan assets	(3,062)		(3,095)		(671)		(581)
Amortization of net loss	1,422		490		544		356
Amortization of prior service cost	—		—		101		111
Net periodic benefit cost	$	3,691	$	2,012	$	2,201	$	1,806

​	Domestic Plans				Foreign Plans
Nine Months Ended September 30,	2020		2019		2020		2019
Service cost	$	10,709	$	8,320	$	5,402	$	4,334
Interest cost	5,284		5,536		1,040		1,487
Expected return on plan assets	(9,186)		(9,284)		(1,936)		(1,759)
Amortization of net loss	4,264		1,468		1,572		1,078
Amortization of prior service cost	—		—		293		337
Net periodic benefit cost	$	11,071	$	6,040	$	6,371	$	5,477

The components of net periodic benefit cost, other than the service cost component, are included in the line “Miscellaneous, net” in the income statement.

EMPLOYER CONTRIBUTIONS

Although we currently have no minimum funding requirements for our domestic and foreign plans, we contributed $204 thousand to our ongoing domestic supplemental employee retirement plan (SERP) annuity contracts during the nine months ended September 30, 2020 and do not expect additional significant contributions during 2020. We have contributed approximately $1.6 million to our foreign defined benefit plans during the nine months ended September 30, 2020 and do not expect additional significant contributions during 2020.