Employee Benefit Plans (Post-Retirement Benefit Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-retirement benefit expenses	$ 1,334	$ 1,231	$ 1,829