Benefit Plans - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Non-Qualified Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 180,204	$ 190,849	$ 175,405
Accumulated benefit obligation	180,204	190,849
Fair value of plan assets	278,420	260,651	$ 236,621
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	18,911	20,513
Accumulated benefit obligation	18,911	20,513
Fair value of plan assets	$ 0	$ 0