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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
May 21, 2020
Dec. 31, 2019
Dec. 03, 2019
Long-term debt, outstanding principal $ 4,043,458   $ 3,813,956  
Long-term debt, unamortized discount (517)   (671)  
Long-term debt, unamortized original fees and costs (55,409)   (47,354)  
Long-term debt, net 3,987,532   3,765,931  
Long-term debt, outstanding principal, current 29,165   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 29,165   26,994  
Long-term debt, outstanding principal, noncurrent 4,014,293   3,786,962  
Long-term debt, unamortized discount, noncurrent (517)   (671)  
Long-term debt, unamortized original fees and costs, noncurrent (55,409)   (47,354)  
Long-term debt, net of current maturities and debt issuance costs $ 3,958,367   $ 3,738,937  
Line of Credit [Member] | Bank Credit Facility [Member]        
Long-term debt, interest rate 2.558%   3.753%  
Long-term debt, outstanding principal $ 989,313   $ 1,305,634  
Long-term debt, unamortized discount (517)   (671)  
Long-term debt, unamortized original fees and costs (14,703)   (14,255)  
Long-term debt, net $ 974,093   $ 1,290,708  
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]        
Long-term debt, interest rate 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 (7,278)   (8,271)  
Long-term debt, net $ 742,722   $ 741,729  
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]        
Long-term debt, interest rate 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 (8,197)   (9,244)  
Long-term debt, net $ 691,803   $ 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 (14,123)   (15,584)  
Long-term debt, net $ 985,877   $ 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 (11,108)      
Long-term debt, net $ 588,892      
Other Long-Term Debt [Member]        
Long-term debt, interest rate 6.124%   11.138%  
Long-term debt, outstanding principal $ 4,145   $ 58,322  
Long-term debt, unamortized discount 0   0  
Long-term debt, unamortized original fees and costs 0   0  
Long-term debt, net $ 4,145   $ 58,322