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Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Projected benefit obligation	$ 60,479	$ 52,142	$ 27,539
Fair value of plan assets	46,161	42,866	$ 20,254
Underfunded status	14,318	9,276
Net actuarial gain (loss)	$ (6,946)	$ (2,622)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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