Nonqualified Benefit Plans Investments (Details 15) - Unfunded Plan - Supplemental Employee Retirement Plan - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Investments in nonqualified benefit plans	$ 158,149	$ 148,800
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Investments in nonqualified benefit plans	109,603	100,104
Life insurance carried on plan participants
Defined Benefit Plan Disclosure [Line Items]
Investments in nonqualified benefit plans	38,356	39,779
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Investments in nonqualified benefit plans	$ 10,190	$ 8,917