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Note 6 - Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Long-term debt, outstanding principal $ 3,954,787 $ 4,030,035
Long-term debt, unamortized discount (1,098) (1,286)
Long-term debt, unamortized original fees and costs (44,483) (49,449)
Long-term debt, net 3,909,206 3,979,300
Long-term debt, outstanding principal, current 26,986 24,181
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 26,986 24,181
Long-term debt, outstanding principal, noncurrent 3,927,801 4,005,854
Long-term debt, unamortized discount, noncurrent (1,098) (1,286)
Long-term debt, unamortized original fees and costs, noncurrent (44,483) (49,449)
Long-term debt, net of current maturities and debt issuance costs $ 3,882,220 $ 3,955,119
Line of Credit [Member] | Bank Credit Facility [Member]    
Long-term debt, interest rate 4.61% 4.651%
Long-term debt, outstanding principal $ 1,696,282 $ 1,771,330
Long-term debt, unamortized discount (1,098) (1,286)
Long-term debt, unamortized original fees and costs (18,786) (21,515)
Long-term debt, net $ 1,676,398 $ 1,748,529
Senior Notes [Member] | Senior Notes 6.875% Due 2023 [Member]    
Long-term debt, interest rate 6.875% 6.875%
Long-term debt, outstanding principal $ 750,000 $ 750,000
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs (6,823) (7,701)
Long-term debt, net $ 743,177 $ 742,299
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 (8,932) (9,594)
Long-term debt, net $ 741,068 $ 740,406
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 (9,942) (10,639)
Long-term debt, net $ 690,058 $ 689,361
Other Long-Term Debt [Member]    
Long-term debt, interest rate 11.029% 11.01%
Long-term debt, outstanding principal $ 58,505 $ 58,705
Long-term debt, unamortized discount 0 0
Long-term debt, unamortized original fees and costs 0 0
Long-term debt, net $ 58,505 $ 58,705