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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes, Net (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Net debt issuance costs | $ (7,601) | $ (8,230)
Senior and convertible senior notes, net | 1,095,606 | 1,095,119
4.50% senior notes due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 175,000 | $ 175,000
Debt instrument, stated rate (percent) | 4.50% | 4.50%
7.15% senior notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 301,707 | $ 301,849
Debt instrument, stated rate (percent) | 7.15% | 7.15%
Unamortized premium | $ 1,707 | $ 1,849
7.00% senior notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 300,000 | $ 300,000
Debt instrument, stated rate (percent) | 7.00% | 7.00%
6.00% senior notes due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 200,000 | $ 200,000
Debt instrument, stated rate (percent) | 6.00% | 6.00%
1.875% convertible senior notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Senior and convertible senior notes, gross | $ 126,500 | $ 126,500
Debt instrument, stated rate (percent) | 1.875% | 1.875%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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