Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefits - Fair Values of Plan Assets by Major Asset Category (Details)

v3.22.0.1
Pension and Other Postretirement Benefits - Fair Values of Plan Assets by Major Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets $ 10,713 $ 7,567 $ 6,615
Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 567 1,277  
Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 3,490 1,567  
Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,342 1,503  
Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 596 797  
Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 4,718 2,423  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 10,713 7,567  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 567 1,277  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 3,490 1,567  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,342 1,503  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 596 797  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 4,718 2,423  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets $ 0 $ 0