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Debt (Narratives) (Details) - USD ($)
 3 Months Ended
Nov. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
May 04, 2021
Debt Disclosure [Abstract]          
Long-term Debt   $ 750,000,000      
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   100,000,000      
Outstanding borrowings   492,560,000      
Current portion of long term debt and finance lease obligations   40,565,000   $ 40,551,000  
Deferred Costs   6,323,000      
Accumulated Amortization, Deferred Finance Costs   1,127,000   898,000  
Unsecured credit lines   2,306,000      
Amount drawn on unsecured credit lines   0      
Stock Issued During Period, Shares, New Issues     4,312,500    
Common Stock, Par or Stated Value Per Share         $ 48.00
Proceeds from Issuance or Sale of Equity   $ 0 $ 207,000,000    
Lessee, Finance Lease, Term of Contract   23 years      
Operating Income (Loss)   $ 22,817,000 10,746,000    
Long-term Debt   750,000,000      
Short-term Debt   40,000,000      
Debt Instrument, Periodic Payment, Principal   10,000,000      
Debt Instrument, Periodic Payment   1,315,000      
Dorner          
Line of Credit Facility [Line Items]          
Operating Income (Loss)     1,164,000    
Debt Issuance Costs, Gross     4,027,000    
Garvey          
Line of Credit Facility [Line Items]          
Debt Instrument, Increase (Decrease), Other, Net $ 75,000,000        
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Accumulated Amortization, Deferred Finance Costs   1,007,000   $ 805,000  
Extinguishment of Debt, Amount     326,000    
Revolving Credit Facility [Member] | Dorner          
Line of Credit Facility [Line Items]          
Debt Issuance Costs, Gross     977,000    
Required payments [Member]          
Line of Credit Facility [Line Items]          
Current portion of long term debt and finance lease obligations   5,260,000      
Secured Debt          
Line of Credit Facility [Line Items]          
Debt Issuance Costs, Gross     5,432,000    
Secured Debt | Loans [Member]          
Line of Credit Facility [Line Items]          
Debt Issuance Costs, Gross   892,000      
Bridge Loan          
Line of Credit Facility [Line Items]          
Extinguishment of Debt, Amount     8,531,000    
New Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Outstanding letters of credit   17,210,000      
Deferred Costs, Noncurrent   4,027,000      
New Revolving Credit Facility | Dorner          
Line of Credit Facility [Line Items]          
Debt Issuance Costs, Gross     3,050,000    
New Revolving Credit Facility | Standby Letters of Credit          
Line of Credit Facility [Line Items]          
Outstanding letters of credit   15,660,000      
New Revolving Credit Facility | Letter of Credit          
Line of Credit Facility [Line Items]          
Outstanding letters of credit   1,550,000      
New Revolving Credit Facility | Unsecured Lines of Credit          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   11,457,000      
Outstanding borrowings   $ 10,136,000      
Long-Term Debt          
Line of Credit Facility [Line Items]          
Extinguishment of Debt, Amount     $ 5,946,000