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Debt (Narratives) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | May 04, 2021 | Mar. 31, 2021
Debt Disclosure [Abstract] |  |  |  |
Long-term Debt | $ 750,000,000 |  |  | $ 545,000,000
Line of Credit Facility [Line Items] |  |  |  |
Maximum availability under New Revolving Credit Facility | 100,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000 |  |  |
Outstanding borrowings | 450,000,000 |  |  |
Current portion of long term debt and finance lease obligations | 60,501,000 |  |  | 4,450,000
Deferred Costs | 14,690,000 |  |  |
Accumulated Amortization, Deferred Finance Costs | 269,000 |  |  | 8,744,000
Unsecured credit lines | 2,608,000 |  |  |
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 | $ 207,000,000 | $ 0 |  |
Lessee, Finance Lease, Term of Contract | 23 years |  |  |
Operating Income (Loss) | $ 10,746,000 | 1,789,000 |  |
Secured Debt | 450,000,000 |  |  | 445,000,000
Long-term Debt | 750,000,000 |  |  | 545,000,000
Extinguishment of Debt, Amount | 14,803,000 | $ 0 |  |
Short-term Debt | 60,000,000 |  |  |
Dorner |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Operating Income (Loss) | 1,164,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Issuance Costs, Gross | 977,000 |  |  |
Revolving Credit Facility [Member] | Dorner |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Issuance Costs, Gross | 3,050,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Accumulated Amortization, Deferred Finance Costs | 201,000 |  |  | 2,313,000
Extinguishment of Debt, Amount | 326,000 |  |  |
Debt Issuance Costs, Gross | 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 | 4,500,000 |  |  |
Secured Debt |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Extinguishment of Debt, Amount | 5,946,000 |  |  |
Debt Issuance Costs, Gross | 5,432,000 |  |  |
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 | 18,784,000 |  |  |
New Revolving Credit Facility | Standby Letters of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Outstanding letters of credit | 16,935,000 |  |  |
New Revolving Credit Facility | Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Outstanding letters of credit | 1,849,000 |  |  |
New Revolving Credit Facility | Unsecured Lines of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 14,996,000 |  |  |
Outstanding borrowings | $ 11,837,000 |  |  |

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