Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:

	Pension Plan				Postretirement Benefit Plan
Three Months Ended March 31,	2022		2021		2022		2021
Net periodic benefit cost
Service cost	$	1,120	$	3,020	$	—	$	148
Interest cost	1,933		1,728		1		69
Expected return on plan assets	(4,723)		(4,202)		—		—
Amortization of prior service credit	(820)		(809)		(3,771)		(3,196)
Amortization of net loss	194		999		706		492
Special event plan closure	—		—		—		(20,177)
Net periodic benefit cost	$	(2,296)	$	736	$	(3,064)	$	(22,664)