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Debt - Schedule Of Components Of Debt (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Debt [Line Items]    
Long-term debt $ 1,060,912,000 $ 1,060,474,000
Less current portion (2) 216,486,000 216,351,000
Long-term debt $ 844,426,000 $ 844,123,000
Economic Development Loans    
Debt [Line Items]    
Debt instrument effective interest rate 3.00% 3.00%
Long-term debt $ 4,416,000 $ 4,416,000
$450 Million Senior Unsecured Notes Due 2031 | Senior    
Debt [Line Items]    
Debt instrument face amount $ 450,000,000 $ 450,000,000
Debt instrument effective interest rate 3.86% 3.86%
Deferred issuance costs $ 5,400,000 $ 5,500,000
Long-term debt 444,622,000 444,470,000
$400 Million Senior Unsecured Notes Due 2029 | Senior    
Debt [Line Items]    
Debt instrument face amount $ 400,000,000 $ 400,000,000
Debt instrument effective interest rate 3.88% 3.88%
Deferred issuance costs $ 4,600,000 $ 4,800,000
Long-term debt 395,388,000 395,237,000
$400 Million Senior Unsecured Notes 2022 | Senior    
Debt [Line Items]    
Debt instrument face amount $ 400,000,000 $ 400,000,000
Debt instrument effective interest rate 6.00% 6.00%
Deferred issuance costs $ 100,000 $ 200,000
Long-term debt 216,486,000 216,351,000
$600 Million Unsecured Revolving Credit Facility | Senior    
Debt [Line Items]    
Deferred issuance costs 2,100,000 2,300,000
Total capacity 600,000,000 600,000,000
Long-term debt $ 0 $ 0