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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Long-term debt, outstanding principal $ 3,080,550 $ 3,069,393
Long-term debt, unamortized discount 0 (293)
Long-term debt, unamortized original fees and costs (46,373) (37,506)
Long-term debt, net 3,034,177 3,031,594
Long-term debt, outstanding principal, current 44,316 41,673
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 44,316 41,673
Long-term debt, outstanding principal, noncurrent 3,036,234 3,027,720
Long-term debt, unamortized discount, noncurrent 0 (293)
Long-term debt, unamortized original fees and costs, noncurrent (46,373) (37,506)
Long-term debt, net of current maturities and debt issuance costs $ 2,989,861 $ 2,989,921
Line of Credit [Member] | Bank Credit Facility [Member]    
Long-term debt, interest rate 2.073% 2.286%
Long-term debt, outstanding principal $ 880,000 $ 867,897
Long-term debt, unamortized discount 0 (293)
Long-term debt, unamortized original fees and costs (18,473) (8,498)
Long-term debt, net $ 861,527 $ 859,106
Senior Notes [Member] | Senior Note 4750 Due 2031 Member    
Long-term debt, interest rate 4.75%  
Long-term debt, outstanding principal $ 1,000,000  
Long-term debt, unamortized discount 0  
Long-term debt, unamortized original fees and costs (11,202)  
Long-term debt, net $ 988,798  
Senior Notes [Member] | Senior Note 6.375% Due 2026 [Member]    
Long-term debt, interest rate   4.75%
Long-term debt, outstanding principal   $ 1,000,000
Long-term debt, unamortized discount   0
Long-term debt, unamortized original fees and costs   (11,688)
Long-term debt, net   $ 988,312
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member]    
Long-term debt, interest rate 8.625%  
Long-term debt, outstanding principal $ 300,000  
Long-term debt, unamortized discount 0  
Long-term debt, unamortized original fees and costs (3,769)  
Long-term debt, net $ 296,231  
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]    
Long-term debt, interest rate   8.625%
Long-term debt, outstanding principal   $ 300,000
Long-term debt, unamortized discount   0
Long-term debt, unamortized original fees and costs   (4,066)
Long-term debt, net   $ 295,934
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [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 (12,929) (13,254)
Long-term debt, net $ 887,071 $ 886,746
Other Long-Term Debt [Member]    
Long-term debt, interest rate 5.534% 5.932%
Long-term debt, outstanding principal $ 550 $ 1,496
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs 0 0
Long-term debt, net $ 550 $ 1,496