Benefit Plans - Changes in Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in projected benefit obligation:
Projected benefit obligation as of the beginning of the period	$ 60,479	$ 52,142
Service cost	1,140	1,347	$ 910
Interest cost	1,538	1,642	1,794
Plan amendment	(446)	0
Actuarial loss (gain)	(2,508)	7,038
Benefits paid	(1,760)	(1,690)
Gain on curtailment of pension obligation	(2,032)	0	0
Projected benefit obligation as of the end of the period	56,411	60,479	52,142
Changes in fair value of plan assets:
Fair value of plan assets as of the beginning of the period	46,161	42,866
Actual return (loss) on plan assets	5,420	4,860
Employer contributions	0	125
Benefits paid	(1,760)	(1,690)
Fair value of plan assets as of the end of the period	$ 49,821	$ 46,161	$ 42,866