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Note 7 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
May 21, 2020
Dec. 31, 2019
Dec. 03, 2019
Jun. 25, 2018
Mar. 28, 2016
Long-term debt, outstanding principal $ 3,949,823   $ 3,813,956      
Long-term debt, unamortized discount (472)   (671)      
Long-term debt, unamortized original fees and costs (51,868)   (47,354)      
Long-term debt, net 3,897,483   3,765,931      
Long-term debt, outstanding principal, current 30,740   26,994      
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 30,740   26,994      
Long-term debt, outstanding principal, noncurrent 3,919,083   3,786,962      
Long-term debt, unamortized discount, noncurrent (472)   (671)      
Long-term debt, unamortized original fees and costs, noncurrent (51,868)   (47,354)      
Long-term debt, net of current maturities and debt issuance costs $ 3,866,743   $ 3,738,937      
Line of Credit [Member] | Bank Credit Facility [Member]            
Long-term debt, interest rate 2.486%   3.753%      
Long-term debt, outstanding principal $ 896,185   $ 1,305,634      
Long-term debt, unamortized discount (472)   (671)      
Long-term debt, unamortized original fees and costs (12,924)   (14,255)      
Long-term debt, net $ 882,789   $ 1,290,708      
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   $ 750,000      
Long-term debt, unamortized discount 0   0      
Long-term debt, unamortized original fees and costs (6,947)   (8,271)      
Long-term debt, net $ 743,053   $ 741,729      
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   $ 700,000      
Long-term debt, unamortized discount 0   0      
Long-term debt, unamortized original fees and costs (7,849)   (9,244)      
Long-term debt, net $ 692,151   $ 690,756      
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member]            
Long-term debt, interest rate 4.75%   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 (13,636)   (15,584)      
Long-term debt, net $ 986,364   $ 984,416      
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          
Long-term debt, unamortized discount 0          
Long-term debt, unamortized original fees and costs (10,512)          
Long-term debt, net $ 589,488          
Other Long-Term Debt [Member]            
Long-term debt, interest rate 6.137%   11.138%      
Long-term debt, outstanding principal $ 3,638   $ 58,322      
Long-term debt, unamortized discount 0   0      
Long-term debt, unamortized original fees and costs 0   0      
Long-term debt, net $ 3,638   $ 58,322