Employee Benefits (Tables)

6 Months Ended

Jun. 30, 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 June 30,	2022		2021		2022		2021
Net periodic benefit cost
Service cost	$	1,120	$	3,020	$	—	$	—
Interest cost	1,933		1,728		1		1
Expected return on plan assets	(4,723)		(4,202)		—		—
Amortization of prior service credit	(820)		(809)		(3,771)		(3,765)
Amortization of net loss	194		999		706		705
Special event plan closure	—		—		—		—
Net periodic benefit cost	$	(2,296)	$	736	$	(3,064)	$	(3,059)

	Pension Plan				Postretirement Benefit Plan
Six Months Ended June 30,	2022		2021		2022		2021
Net periodic benefit cost
Service cost	$	2,240	$	6,040	$	—	$	148
Interest cost	3,865		3,456		1		70
Expected return on plan assets	(9,445)		(8,404)		—		—
Amortization of prior service credit	(1,640)		(1,618)		(7,543)		(6,962)
Amortization of net loss	388		1,998		1,412		1,197
Special event plan closure	—		—		—		(20,177)
Net periodic benefit cost	$	(4,591)	$	1,472	$	(6,129)	$	(25,724)