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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2015 | Apr. 30, 2012 | Dec. 31, 2011
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4.50% senior notes [Member] |  |  |  |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Debt instrument, stated rate |  |  | 4.50% |  |  |  |
7.15% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  |  |  | $ 200,000,000.0
Fair value of fixed-rate debt |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  | 7.15%
7.00% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  |  | $ 300,000,000.0 |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Debt instrument, stated rate | 7.00% | 7.00% |  |  |  | 7.00% |
7.00% senior notes [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 | 319,758,000 | $ 327,390,000 |  |  |  |  |
6.00% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 200,000,000.0 |  |  |  | $ 200,000,000.0 |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Debt instrument, stated rate | 6.00% | 6.00% |  |  | 6.00% |  |
6.00% senior notes [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 | $ 451,913,000 | $ 449,200,000 |  |  |  |  |
5.125% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  | $ 300,000,000.0 |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Debt instrument, stated rate | 5.125% | 5.125% |  | 5.125% |  |  |
5.125% senior notes [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 | $ 333,328,000 | $ 319,500,000 |  |  |  |  |

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