Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
FAIR VALUE MEASUREMENTS (Fair Value of Debt) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
6.5% Senior Secured Notes Due 2027 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes $ 1,330,548 $ 1,340,688
3.75% Senior Secured Notes Due 2028 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 502,050 0
4.75% Senior Notes due 2027 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 985,483 970,872
4.875% Senior Notes Due 2024 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 585,879 581,480
5.625% Senior Notes Due 2026 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 313,065 307,785
2.5% Convertible Senior Notes Due 2023    
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes 771,848 720,764
2.0% Convertible Senior Notes Due 2025 [Member]    
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes $ 448,424 $ 425,172