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Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 2,711	$ 2,390	$ 8,134	$ 7,170
Interest cost	2,556	2,860	7,666	8,580
Expected return on assets	(4,748)	(4,126)	(14,242)	(12,429)
Unrecognized actuarial loss	1,788	1,296	5,362	3,888
Amortization of prior service cost	12	39	37	115
Net periodic benefit cost	$ 2,319	$ 2,459	$ 6,957	$ 7,324

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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