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Note 6 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Long-term debt, outstanding principal $ 2,979,089 $ 3,088,474
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs (35,123) (39,065)
Long-term debt, net 2,943,966 3,049,409
Long-term debt, outstanding principal, current 44,275 44,275
Long-term debt, unamortized discount, current 0 0
Long-term debt, unamortized original fees and costs, current 0 0
Current maturities of long-term debt 44,275 44,275
Long-term debt, outstanding principal, noncurrent 2,934,814 3,044,199
Long-term debt, unamortized discount, noncurrent 0 0
Long-term debt, unamortized original fees and costs, noncurrent (35,123) (39,065)
Long-term debt, net of current maturities and debt issuance costs $ 2,899,691 $ 3,005,134
Line of Credit [Member] | Bank Credit Facility [Member]    
Long-term debt, interest rate 6.652% 6.166%
Long-term debt, outstanding principal $ 1,078,500 $ 1,187,800
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs (15,572) (17,865)
Long-term debt, net $ 1,062,928 $ 1,169,935
Senior Notes [Member] | Senior Note 4.750% Due 2027 [Member]    
Long-term debt, interest rate 4.75% 4.75%
Long-term debt, outstanding principal $ 1,000,000 $ 1,000,000
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs (8,766) (9,740)
Long-term debt, net $ 991,234 $ 990,260
Senior Notes [Member] | Senior Note 4750 Due 2031 Member    
Long-term debt, interest rate 4.75% 4.75%
Long-term debt, outstanding principal $ 900,000 $ 900,000
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs (10,785) (11,460)
Long-term debt, net $ 889,215 $ 888,540
Other Long-Term Debt [Member]    
Long-term debt, interest rate 5.208% 5.208%
Long-term debt, outstanding principal $ 589 $ 674
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs 0 0
Long-term debt, net $ 589 $ 674