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Employee Benefit Plans (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 02, 2018
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
calendar_year
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Amortization of unrecognized net actuarial loss     $ (814) $ (21) $ (211)
Expected average annual rate of return         7.75%
401(k) Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferral rate     5.00%    
Percent of annual salary employees may contribute     15.00%    
Percent matched by company up to 3 percent of employee salary       100.00%  
Percent matched by company 3-5 percent of employee salary       50.00%  
Percent matched by company up to 6 percent of employee salary 100.00%        
Matching contributions     $ 4,200 $ 3,600 $ 2,300
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation     41,592 36,354 $ 38,150
Amortization of unrecognized net actuarial loss     (977) $ (34)  
Expected average annual rate of return       2.75%  
Pension Plan | Equity Securities          
Defined Benefit Plan Disclosure [Line Items]          
Pension plans allocated assets         75.00%
Pension Plan | Fixed Income Investments          
Defined Benefit Plan Disclosure [Line Items]          
Pension plans allocated assets         25.00%
SERP          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation     5,638 $ 5,794 $ 5,970
Amortization of unrecognized net actuarial loss     $ 163 $ 13  
Lifetime monthly pension benefits, percent     3.00%    
Maximum percent of final average compensation     60.00%    
Percent of participant's primary social security benefit     50.00%    
Number of highest consecutive calendar years of earnings | calendar_year     5    
Forecast | Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Amortization of unrecognized net actuarial loss   $ 930      
Forecast | SERP          
Defined Benefit Plan Disclosure [Line Items]          
Amortization of unrecognized net actuarial loss   $ 157      
Maximum | SERP          
Defined Benefit Plan Disclosure [Line Items]          
Maximum years of service     20 years