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Note 10 - Fair Value Measurements - Long-Term Debt (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Long-term debt $ 3,850,687 $ 4,030,035
Reported Value Measurement [Member]    
Long-term debt 3,807,744 3,979,300
Estimate of Fair Value Measurement [Member]    
Long-term debt 3,958,017 3,918,672
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]    
Long-term debt 1,592,308 1,771,330
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]    
Long-term debt 1,573,944 1,748,529
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]    
Long-term debt 1,592,575 1,720,654
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member]    
Long-term debt 750,000 750,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]    
Long-term debt 743,615 742,299
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]    
Long-term debt 776,250 757,500
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member]    
Long-term debt 750,000 750,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]    
Long-term debt 741,399 740,406
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]    
Long-term debt 794,063 724,688
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member]    
Long-term debt 700,000 700,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]    
Long-term debt 690,407 689,361
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]    
Long-term debt 736,750 657,125
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]    
Long-term debt 58,379 58,705
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]    
Long-term debt 58,379 58,705
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]    
Long-term debt $ 58,379 $ 58,705