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SENIOR AND CONVERTIBLE SENIOR NOTES - Schedule of Senior and Convertible Senior Notes (Parenthetical) (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2015 | Jun. 02, 2015 | Dec. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2012 | Apr. 30, 2012 | Dec. 31, 2010
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4.50% senior notes due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated rate | 4.50% |  | 4.50% | 4.50% |  |  |
7.15% senior notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated rate | 7.15% |  | 7.15% |  |  |  | 7.15%
Unamortized premium | $ 2,418 |  | $ 2,986 |  |  |  |
7.00% senior notes due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated rate | 7.00% |  | 7.00% |  |  | 7.00% |
6.00% senior notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated rate | 6.00% | 6.00% | 6.00% |  |  |  |
1.875% convertible senior notes due 2032 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated rate | 1.875% |  | 1.875% |  | 1.875% |  |

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