SENIOR AND CONVERTIBLE SENIOR NOTES - Schedule of Senior and Convertible Senior Notes (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | $ 1,103,918 | $ 904,486 |
| 4.50% senior notes due 2018 [Member] | ||
| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | 175,000 | 175,000 |
| 7.15% senior notes due 2020 [Member] | ||
| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | 302,418 | 302,986 |
| 7.00% senior notes due 2022 [Member] | ||
| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | 300,000 | 300,000 |
| 6.00% senior notes due 2025 [Member] | ||
| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | 200,000 | 0 |
| 1.875% convertible senior notes due 2032 [Member] | ||
| Debt Instrument [Line Items] | ||
| Senior and convertible senior notes | $ 126,500 | $ 126,500 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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