Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details)

v3.21.1
FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($)
Mar. 31, 2021
Dec. 31, 2020
7.00% senior notes due 2022 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 7.00%  
7.00% senior notes due 2022 [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Aggregate Principal $ 300,000,000 $ 300,000,000
Fair value of fixed-rate debt    
Estimated Fair Value $ 314,250,000 319,758,000
6.00% senior notes due 2025 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 6.00%  
6.00% senior notes due 2025 [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Aggregate Principal $ 400,000,000 400,000,000
Fair value of fixed-rate debt    
Estimated Fair Value $ 449,000,000 451,913,000
5.125% senior notes due 2027 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 5.125%  
5.125% senior notes due 2027 [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Aggregate Principal $ 300,000,000 300,000,000
Fair value of fixed-rate debt    
Estimated Fair Value $ 330,390,000 $ 333,328,000