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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 09, 2021
Jun. 08, 2021
Dec. 31, 2020
Long-term debt, outstanding principal $ 3,386,943     $ 3,949,823
Long-term debt, unamortized discount (382)     (472)
Long-term debt, unamortized original fees and costs (47,011)     (51,868)
Long-term debt, net 3,339,550     3,897,483
Long-term debt, outstanding principal, current 39,324     30,740
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 39,324     30,740
Long-term debt, outstanding principal, noncurrent 3,347,619     3,919,083
Long-term debt, unamortized discount, noncurrent (382)     (472)
Long-term debt, unamortized original fees and costs, noncurrent (47,011)     (51,868)
Long-term debt, net of current maturities and debt issuance costs $ 3,300,226     $ 3,866,743
Line of Credit [Member] | Bank Credit Facility [Member]        
Long-term debt, interest rate 2.471%     2.486%
Long-term debt, outstanding principal $ 884,648     $ 896,185
Long-term debt, unamortized discount (382)     (472)
Long-term debt, unamortized original fees and costs (10,587)     (12,924)
Long-term debt, net $ 873,679     $ 882,789
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 $ 1,000,000     $ 1,000,000
Long-term debt, unamortized discount 0     0
Long-term debt, unamortized original fees and costs (12,662)     (13,636)
Long-term debt, net $ 987,338     $ 986,364
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]        
Long-term debt, interest rate   6.375% 6.375% 6.375%
Long-term debt, outstanding principal       $ 750,000
Long-term debt, unamortized discount       0
Long-term debt, unamortized original fees and costs       (6,947)
Long-term debt, net       $ 743,053
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member]        
Long-term debt, interest rate 8.625%     8.625%
Long-term debt, outstanding principal $ 600,000     $ 600,000
Long-term debt, unamortized discount 0     0
Long-term debt, unamortized original fees and costs (9,322)     (10,512)
Long-term debt, net $ 590,678     $ 589,488
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]        
Long-term debt, interest rate   6.00% 6.00% 6.00%
Long-term debt, outstanding principal       $ 700,000
Long-term debt, unamortized discount       0
Long-term debt, unamortized original fees and costs       (7,849)
Long-term debt, net       $ 692,151
Senior Notes [Member] | The 4.750% Senior Notes Due June 2031 [Member]        
Long-term debt, interest rate 4.75%   4.75%  
Long-term debt, outstanding principal $ 900,000      
Long-term debt, unamortized discount 0      
Long-term debt, unamortized original fees and costs (14,440)      
Long-term debt, net $ 885,560      
Other Long-Term Debt [Member]        
Long-term debt, interest rate 6.184%     6.137%
Long-term debt, outstanding principal $ 2,295     $ 3,638
Long-term debt, unamortized discount 0     0
Long-term debt, unamortized original fees and costs 0     0
Long-term debt, net $ 2,295     $ 3,638