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Employee Retirement Plans - Narrative (Details) - USD ($)
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined benefit plan, benefit obligation   $ 52,100,000
Non-qualified Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer contributions $ 100,000  
Expected employer contributions, remainder of fiscal year 300,000  
Qualified Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Expected employer contributions, remainder of fiscal year $ 0