Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Fair Value of Debt) (Details)

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FAIR VALUE MEASUREMENTS (Fair Value of Debt) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
6.5% Senior Secured Notes Due 2027 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes $ 1,330,212 $ 1,340,688
3.75% Senior Secured Notes Due 2028 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 493,160 0
4.75% Senior Notes due 2027 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 954,978 970,872
4.875% Senior Notes Due 2024 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 584,568 581,480
5.625% Senior Notes Due 2026 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 308,853 307,785
2.5% Convertible Senior Notes Due 2023    
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes 768,625 720,764
2.0% Convertible Senior Notes Due 2025 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes $ 440,368 $ 425,172