Employee Benefit Plans (Plan Assets at Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity partnerships
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
Employee Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	$ 73,375	$ 71,940	$ 73,357
Employee Pension Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	57,499	58,253
Employee Pension Plans | Level 1 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	57,499	58,253
Employee Pension Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	3,057	3,086
Employee Pension Plans | Level 2 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	3,057	3,086
Employee Pension Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Level 3 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	60,556	61,339
Employee Pension Plans | Fair Value Measured at Net Asset Value Per Share | Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	12,819	10,601
Employee Pension Plans | Cash and cash equivalents | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	2,533	1,582
Employee Pension Plans | Cash and cash equivalents | Level 1 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	2,533	1,582
Employee Pension Plans | Cash and cash equivalents | Level 2 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Cash and cash equivalents | Level 3 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Fixed income funds | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	3,057	5,086
Employee Pension Plans | Fixed income funds | Level 1 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	2,000
Employee Pension Plans | Fixed income funds | Level 2 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	3,057	3,086
Employee Pension Plans | Fixed income funds | Level 3 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Mutual funds | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	54,966	54,671
Employee Pension Plans | Mutual funds | Level 1 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	54,966	54,671
Employee Pension Plans | Mutual funds | Level 2 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Mutual funds | Level 3 | Non-Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	0	0
Employee Pension Plans | Equity partnerships | Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	4,259	3,700
Employee Pension Plans | Hedge fund investments | Closely Held Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plans' assets	$ 8,560	$ 6,901