Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Income for the Pension Plans

Net periodic benefit income from the Company's pension plans included the following components:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Service cost	$	3,101	$	2,925	$	6,142	$	5,907
Interest cost	17,962		20,865		35,868		41,790
Expected return on plan assets	(38,858)		(38,410)		(77,590)		(76,933)
Amortization of prior service credit	172		173		344		346
Amortization of actuarial loss	12,509		11,088		24,965		22,210
Net periodic benefit income	$	(5,114)	$	(3,359)	$	(10,271)	$	(6,680)