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Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 2,735	$ 2,443
Interest cost	2,580	2,904
Expected return on assets	(4,752)	(4,120)
Unrecognized actuarial loss	1,780	758
Amortization of prior service cost	12	741
Net periodic benefit cost	$ 2,355	$ 2,726

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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 prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit 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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