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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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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 | $ 318,000,000 | 327,390,000
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 | $ 444,520,000 | 449,200,000
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 | $ 333,030,000 | $ 319,500,000

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