Employee Benefits (Narrative) (Details) $ in Thousands	12 Months Ended			120 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 30, 2023 yr
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution amounts	$ 3,000	$ 2,800	$ 2,700
Deferred compensation plan, accrued liability	$ 21,200	19,400
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution	3.00%
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded (unfunded) status at end of period	$ 13,639	7,187
Accumulated benefit obligation	$ 85,200	87,900
Fair value of equity securities, maximum percentage held by a single issuer	10.00%
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded (unfunded) status at end of period	$ (17,717)	(17,973)
Available-for-sale securities and other short-term investments, rabbi trusts	16,700	$ 13,700
Accumulated benefit obligation	16,400
Estimated future employer contributions in next fiscal year	$ 905
Non-elective Employer Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution	4.00%
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Transition Period Pension Plan Amendment | yr				10