Employee Benefit Plans (Schedule of Change in Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Benefit Plan [Member]
Change in Fair Value of Plan Assets:
Beginning Balance	$ 66,771	$ 69,215
Actual Return on Plan Assets	12,753	(3,524)
Employer Contributions	3,677	3,635
Benefits Paid	(2,821)	(2,555)
Ending Balance	80,380	66,771
Funded Status	(20,511)	(17,156)
Other Benefits Plan [Member]
Change in Fair Value of Plan Assets:
Beginning Balance	34,622	36,083
Actual Return on Plan Assets	5,192	(2,161)
Employer Contributions	1,601	1,444
Benefits Paid	(802)	(744)
Ending Balance	40,613	34,622
Funded Status	$ (14,553)	$ (13,852)