Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 32,043	$ 24,051	$ 15,716
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	32,043	1,311
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	13,192
Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	9,548
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	32,043	24,051
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	32,043	1,311
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	13,192
Level 1 | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	9,548
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 2 | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 3 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Level 3 | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0	$ 0