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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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7.15% senior notes due 2020 [Member] |  |
Fair value of fixed-rate debt |  |
Stated interest rate | 7.15% | 7.15%
7.15% senior notes due 2020 [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 | $ 309,750,000 | $ 307,500,000
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 | $ 320,250,000 | $ 309,750,000
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 | $ 418,000,000 | $ 379,520,000
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 | $ 290,910,000 | $ 255,750,000

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