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Employee Retirement Plans (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Apr. 30, 2021
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution plan, minimum annual contributions per participating employee (as percent)     1.00%      
Defined contribution plan, maximum annual contributions per employee (as percent)     70.00%      
Defined contribution plan, cost recognized     $ 1,600 $ 1,500 $ 1,500  
Projected benefit obligations $ 56,818   $ 56,818 $ 61,570 60,334  
Lump sum payout   $ 7,000        
Settlement gain, before tax   $ 200        
Defined benefit plan, remeasurement, discount rate       0.0251    
Defined benefit plan, assumptions used calculating benefit obligation, discount rate       2.75%    
Expected return on plan assets, net of administrative fees (as percent)     2.25%      
Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Projected benefit obligations $ 56,818   $ 56,818 $ 61,570    
Pension Plan | Forecast            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Projected benefit obligations           $ 52,100
Qualified plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Contributions to the qualified plan     $ 3,000 $ 1,000 $ 1,000  
Expected return on plan assets, net of administrative fees (as percent) 2.75%   5.00% 5.75% 6.25%  
Unfunded plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Projected benefit obligations $ 4,700   $ 4,700 $ 4,600    
Contribution Tranche One            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution plan, employer matching contribution, percent of match (as percent)     100.00%      
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)     3.00%      
Contribution Tranche Two            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution plan, employer matching contribution, percent of match (as percent)     50.00%      
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)     3.00%