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Borrowing Arrangements - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2019
USD ($)
Sep. 30, 2021
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
Jun. 30, 2020
Dec. 31, 2020
USD ($)
Feb. 16, 2021
USD ($)
May 06, 2020
USD ($)
Mar. 31, 2020
Debt Instrument [Line Items]                  
Debt instrument, covenant compliance       As of March 31, 2021, the Company was in compliance with its debt covenants under the Credit Agreement.          
Long-term borrowings       $ 370,900,000   $ 362,100,000      
Redemptions of convertible debentures       0   0      
Approximate redemption value of convertible debentures       1,100,000   1,100,000      
Interest Rate Contract                  
Debt Instrument [Line Items]                  
Interest rate collar, term 3 years                
Notional amount $ 222,300,000                
Interest rate collar contract maturity date 2022-04                
Derivative, cap interest rate 2.50%                
Liability       2,500,000   3,100,000      
Interest paid       $ 600,000          
Senior Credit Facility, Net of Discount                  
Debt Instrument [Line Items]                  
Senior credit facility maturity date       Nov. 30, 2023          
Long-term borrowings       $ 343,900,000   $ 332,300,000      
Weighted average interest rate       3.60%         2.60%
Convertible Subordinated Debt                  
Debt Instrument [Line Items]                  
Redemption price upon stated maturity (in dollars per share) | $ / shares       $ 19.18          
Redemptions stated maturity date       Apr. 01, 2028          
Convertible debentures maturity per share | $ / shares       $ 25          
Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 595,000,000.0  
Percentage principal installments       1.25%          
Amended Credit Agreement | Forecast                  
Debt Instrument [Line Items]                  
Percentage principal installments     1.875%            
Amended Credit Agreement | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity             $ 325,000,000.0 370,000,000.0  
Decrease to borrowing capacity             45,000,000.0    
Liquidity test minimum       $ 40,000,000.0          
Additional liquidity test minimum             $ 40,000,000.0    
Amended Credit Agreement | Revolving Credit Facility | Forecast                  
Debt Instrument [Line Items]                  
Liquidity test minimum     $ 40,000,000.0            
Amended Credit Agreement | Letter of Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               100,000,000.0  
Amended Credit Agreement | Term Loan Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 225,000,000.0  
Amended Credit Agreement | Senior Credit Facility, Net of Discount                  
Debt Instrument [Line Items]                  
Fees and other closing cost       1,200,000          
Letters of credit outstanding       49,500,000          
Long-term borrowings       $ 344,700,000          
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Maximum                  
Debt Instrument [Line Items]                  
Total debt to EBITDA ratio that is required to be maintained         5.50        
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Minimum                  
Debt Instrument [Line Items]                  
Total debt to EBITDA ratio that is required to be maintained         3.50        
Fixed charge coverage ratio that is required to be maintained       1.60 3.50        
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Forecast | Maximum                  
Debt Instrument [Line Items]                  
Total debt to EBITDA ratio that is required to be maintained   5.25              
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Interest rate       0.375%          
Amended Credit Agreement | Senior Credit Facility, Net of Discount | L I B O R Loans                  
Debt Instrument [Line Items]                  
Period of total debt to EBITDA ratio       12 months          
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Base Rate Loans | Federal Funds                  
Debt Instrument [Line Items]                  
Interest rate margin on variable rate basis       0.50%          
Amended Credit Agreement | Senior Credit Facility, Net of Discount | Base Rate Loans | LIBOR                  
Debt Instrument [Line Items]                  
Interest rate margin on variable rate basis       2.75%          
Floor interest rate       1.00%          
Senior Credit Facility | Senior Credit Facility, Net of Discount                  
Debt Instrument [Line Items]                  
Weighted average interest rate       3.80%         2.70%