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Debt (Narratives) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
May 04, 2021
Mar. 31, 2021
Debt Disclosure [Abstract]              
Long-term Debt $ 750,000,000     $ 750,000,000     $ 545,000,000
Line of Credit Facility [Line Items]              
Maximum availability under New Revolving Credit Facility 100,000,000     100,000,000      
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000     100,000,000      
Outstanding borrowings 512,560,000     512,560,000      
Current portion of long term debt and finance lease obligations 40,530,000     40,530,000     4,450,000
Deferred Costs 14,690,000     14,690,000      
Accumulated Amortization, Deferred Finance Costs 669,000     669,000     8,744,000
Unsecured credit lines $ 2,501,000     2,501,000      
Amount drawn on unsecured credit lines       0      
Stock Issued During Period, Shares, New Issues 4,312,500 4,312,500          
Common Stock, Par or Stated Value Per Share           $ 48.00  
Proceeds from Issuance or Sale of Equity       $ 207,000,000 $ 0    
Lessee, Finance Lease, Term of Contract 23 years     23 years      
Operating Income (Loss) $ 15,316,000   $ 10,447,000 $ 49,722,000 28,056,000    
Secured Debt 450,000,000     450,000,000     445,000,000
Long-term Debt 750,000,000     750,000,000     545,000,000
Extinguishment of Debt, Amount 0   $ 0 14,803,000 $ 0    
Short-term Debt 40,000,000     40,000,000      
Debt Instrument, Periodic Payment, Principal 6,315,000     12,440,000      
Debt Instrument, Periodic Payment 1,315,000     2,440,000      
Debt Instrument, Increase (Decrease), Other, Net 75,000,000            
Dorner              
Line of Credit Facility [Line Items]              
Operating Income (Loss) 4,157,000     8,481,000      
Garvey              
Line of Credit Facility [Line Items]              
Intangible Assets, Gross (Excluding Goodwill) 21,040,000     21,040,000      
Debt Instrument, Increase (Decrease), Other, Net 75,000,000            
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross 977,000     977,000      
Revolving Credit Facility [Member] | Dorner              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross 3,050,000     3,050,000      
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Accumulated Amortization, Deferred Finance Costs 604,000     604,000     2,313,000
Extinguishment of Debt, Amount 326,000            
Debt Issuance Costs, Gross 4,027,000     4,027,000     $ 3,615,000
Required payments [Member]              
Line of Credit Facility [Line Items]              
Current portion of long term debt and finance lease obligations 5,250,000     5,250,000      
Secured Debt              
Line of Credit Facility [Line Items]              
Extinguishment of Debt, Amount 5,946,000            
Debt Issuance Costs, Gross 5,432,000     5,432,000      
Secured Debt | Loans [Member]              
Line of Credit Facility [Line Items]              
Debt Issuance Costs, Gross 892,000     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 17,109,000     17,109,000      
New Revolving Credit Facility | Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit 16,007,000     16,007,000      
New Revolving Credit Facility | Letter of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit 1,102,000     1,102,000      
New Revolving Credit Facility | Unsecured Lines of Credit              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity 12,900,000     12,900,000      
Outstanding borrowings $ 9,478,000     $ 9,478,000