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Note 6 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 02, 2022
Long-Term Line of Credit $ 1,078,500   $ 1,078,500   $ 1,187,800  
Gain (Loss) on Extinguishment of Debt (0) $ (16,509) (0) $ (19,809)    
Revolving Credit Facility [Member]            
Debt Instrument, Face Amount 200,000   200,000      
Bank Credit Facility [Member]            
Line of Credit Facility, Remaining Borrowing Capacity 1,182,700   1,182,700      
Gain (Loss) on Extinguishment of Debt       3,300    
Deferred Debt Issuance Cost, Writeoff       $ 3,300    
Bank Credit Facility [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,450,000
Bank Credit Facility [Member] | Letter of Credit [Member]            
Long-Term Line of Credit 13,800   13,800      
Swing Loan [Member]            
Line of Credit Facility, Maximum Borrowing Capacity 53,500   53,500      
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member]            
Gain (Loss) on Extinguishment of Debt $ (16,500)   (16,500)      
Extinguishment of Debt, Amount     $ 300,000      
Debt Instrument, Interest Rate, Stated Percentage 8.625%   8.625%      
Gain (Loss) on Extinguishment of Debt, before Debt Issuance Cost Writeoff $ (12,900)   $ (12,900)      
Deferred Debt Issuance Cost, Writeoff $ 3,600   $ 3,600