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SENIOR AND CONVERTIBLE SENIOR NOTES - Schedule of Senior and Convertible Senior Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |
Net debt issuance costs | $ (8,230) | $ (10,745)
Senior and convertible senior notes, net | 1,095,119 | 1,093,173
4.50% senior notes due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | 175,000 | 175,000
7.15% senior notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | 301,849 | 302,418
7.00% senior notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | 300,000 | 300,000
6.00% senior notes due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | 200,000 | 200,000
1.875% convertible senior notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 126,500 | $ 126,500

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