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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Long-term debt, outstanding principal $ 4,440,782 $ 3,813,956
Long-term debt, unamortized discount (608) (671)
Long-term debt, unamortized original fees and costs (45,077) (47,354)
Long-term debt, net 4,395,097 3,765,931
Long-term debt, outstanding principal, current 27,000 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 27,000 26,994
Long-term debt, outstanding principal, noncurrent 4,413,782 3,786,962
Long-term debt, unamortized discount, noncurrent (608) (671)
Long-term debt, unamortized original fees and costs, noncurrent (45,077) (47,354)
Long-term debt, net of current maturities and debt issuance costs $ 4,368,097 $ 3,738,937
Line of Credit [Member] | Bank Credit Facility [Member]    
Long-term debt, interest rate 2.765% 3.753%
Long-term debt, outstanding principal $ 1,932,560 $ 1,305,634
Long-term debt, unamortized discount (608) (671)
Long-term debt, unamortized original fees and costs (13,145) (14,255)
Long-term debt, net $ 1,918,807 $ 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 (7,940) (8,271)
Long-term debt, net $ 742,060 $ 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 (8,895) (9,244)
Long-term debt, net $ 691,105 $ 690,756
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 (15,097) (15,584)
Long-term debt, net $ 984,903 $ 984,416
Other Long-Term Debt [Member]    
Long-term debt, interest rate 11.148% 11.138%
Long-term debt, outstanding principal $ 58,222 $ 58,322
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs 0 0
Long-term debt, net $ 58,222 $ 58,322