Employee Benefit Plans - Net Periodic Pension and Postretirement Benefit Costs (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	$ 1,280	$ 1,230	$ 1,050
Interest costs	800	930	1,070
Expected return on plan assets	(1,530)	(1,450)	(1,400)
Amortization of net (gain)/loss	910	890	580
Net periodic benefit cost (income)	$ 1,460	$ 1,600	$ 1,300