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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
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4.50% senior notes due 2018 [Member] |  |
Fair value of fixed-rate debt |  |
Debt instrument, stated rate (percent) | 4.50% | 4.50%
4.50% senior notes due 2018 [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate Principal | $ 175,000,000 | $ 175,000,000
Fair value of fixed-rate debt |  |
Estimated Fair Value | $ 178,063,000 | $ 175,000,000
7.15% senior notes due 2020 [Member] |  |
Fair value of fixed-rate debt |  |
Debt instrument, stated rate (percent) | 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 | $ 324,000,000 | $ 315,750,000
7.00% senior notes due 2022 [Member] |  |
Fair value of fixed-rate debt |  |
Debt instrument, stated rate (percent) | 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 | $ 321,000,000 | $ 313,500,000
6.00% senior notes due 2025 [Member] |  |
Fair value of fixed-rate debt |  |
Debt instrument, stated rate (percent) | 6.00% | 6.00%
6.00% senior notes due 2025 [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate Principal | $ 200,000,000 | $ 200,000,000
Fair value of fixed-rate debt |  |
Estimated Fair Value | $ 202,000,000 | $ 197,500,000
1.875% convertible senior notes due 2032 [Member] |  |
Fair value of fixed-rate debt |  |
Debt instrument, stated rate (percent) | 1.875% | 1.875%
1.875% convertible senior notes due 2032 [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate Principal | $ 126,500,000 | $ 126,500,000
Fair value of fixed-rate debt |  |
Estimated Fair Value | $ 125,077,000 | $ 124,128,000

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