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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net |  | $ 1,093,659 | $ 1,093,173
Net debt issuance costs | [1] | (10,116) | (10,745)
4.50% senior notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net |  | 175,000 | 175,000
7.15% senior notes due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net |  | 302,275 | 302,418
7.00% senior notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net |  | 300,000 | 300,000
6.00% senior notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net |  | 200,000 | 200,000
1.875% convertible senior notes due 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, net | [2] | $ 126,500 | $ 126,500
[1] | As discussed in Note 1, the adoption of ASU 2015-03 resulted in a retrospective reclassification of our debt costs from Prepaids, other assets and goodwill to Senior and convertible senior notes, net on our December 31, 2015 balance sheet in the amount of $10.7 million.
[2] | The Convertible Notes may be redeemed by the note-holders on the fifth, tenth and fifteenth anniversary dates of the issuance date of the Convertible Notes (September 18, 2012).

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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