Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($)
Mar. 31, 2020
Dec. 31, 2019
7.15% senior notes due 2020 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 7.15% 7.15%
7.00% senior notes due 2022 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 7.00% 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 $ 292,500,000 $ 327,390,000
6.00% senior notes due 2025 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 6.00% 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 $ 372,000,000 $ 449,200,000
5.125% senior notes due 2027 [Member]    
Fair value of fixed-rate debt    
Stated interest rate 5.125% 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 $ 271,500,000 $ 319,500,000