Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details)

v3.19.3.a.u2
Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 6,615 $ 5,313 $ 5,356
Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 528 407  
Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,133 813  
Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,939 2,448  
Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 465 1,645  
Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,550    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,615 5,313  
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 plan assets 528 407  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,133 813  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,939 2,448  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 465 1,645  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,550    
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of 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 plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 $ 0  
Significant Unobservable Inputs (Level 3) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0