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Employee Retirement Plans (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
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   $ 1,700 $ 1,600 $ 1,500  
Projected benefit obligations   $ 51,507 56,818 61,570  
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)   2.75%      
Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Projected benefit obligations   $ 51,507 56,818   $ 47,200
Qualified plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Contributions to the qualified plan   $ 0 $ 3,000 $ 1,000  
Expected return on plan assets, net of administrative fees (as percent) 2.75% 2.25% 5.00% 5.75%  
Unfunded plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Projected benefit obligations   $ 4,300 $ 4,700    
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%