Employee Benefit Plans - Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net periodic benefit cost
Employer contributions			$ 1,300	$ 1,800
Pension [Member]
Net periodic benefit cost
Service cost	$ 16	$ 19	32	38
Interest cost	501	427	1,002	854
Expected return on plan assets	(748)	(609)	(1,496)	(1,218)
Amortization of prior service cost	55	45	110	90
Amortization of net loss	(667)	(843)	(1,334)	(1,686)
Net periodic benefit cost	$ 491	$ 725	$ 982	$ 1,450