Employee Benefit Plans (Schedule of Fair Value of Other Benefits Plan Assets) (Details) - Other Benefits Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value of plan assets	$ 40,613	$ 34,622	$ 36,083
Fair Value, Level 1 [Member]
Fair value of plan assets	27,220	21,693
Fair Value, Level 2 [Member]
Fair value of plan assets	13,393	12,929
Fair Value, Level 3 [Member]
Fair value of plan assets
Debt Securities [Member]
Fair value of plan assets	13,393	12,929
Mutual Funds [Member]
Fair value of plan assets	24,361	18,924
Mutual Funds [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets	24,361	18,924
Mutual Funds [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets
Mutual Funds [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets
Money Market Funds [Member]
Fair value of plan assets	2,859	2,769
Money Market Funds [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets	2,859	2,769
Money Market Funds [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets
Money Market Funds [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets
Debt Securities [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets
Debt Securities [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets	13,393	12,929
Debt Securities [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets