Annual report pursuant to Section 13 and 15(d)

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

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Pension and Other Postretirement Benefits - Fair Values of Plan Assets by Major Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets $ 11,650 $ 10,713 $ 7,567
Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 2,571 567  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 392 3,490  
Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 2,884 1,342  
Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 598 596  
Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 5,205 4,718  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 11,650 10,713  
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 2,571 567  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 392 3,490  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 2,884 1,342  
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 598 596  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 5,205 4,718  
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) | Equity Securities      
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) | Equity Securities      
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