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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2015
--- | --- | --- | ---
4.50% senior notes due 2018 [Member] |  |  |
Fair value of fixed-rate debt |  |  |
Stated interest rate | 4.50% | 4.50% |
4.50% senior notes due 2018 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal |  | $ 175,000,000 |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value |  | $ 175,228,000 |
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 | $ 316,500,000 | $ 326,250,000 |
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 | 327,750,000 | $ 337,500,000 |
6.00% senior notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | $ 400,000,000.0 |  |
Fair value of fixed-rate debt |  |  |
Stated interest rate | 6.00% | 6.00% | 6.00%
6.00% senior notes due 2025 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | $ 400,000,000 | $ 200,000,000 |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | $ 410,080,000 | $ 214,000,000 |
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 | $ 283,500,000 | $ 305,250,000 |

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