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LONG-TERM DEBT - Schedule of Outstanding Senior Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Oct. 09, 2018 | Mar. 21, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total Legacy Notes | $ 20,472,917 |  |  | $ 20,649,181
Stated interest rate | 8.75% |  |  |
6.875% Senior Notes Due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 6.875% | 6.875% |
7.25% Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 7.25% | 7.25% |
Legacy Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Legacy Notes | $ 475,000 |  |  | 475,000
Legacy Notes | 6.875% Senior Notes Due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Legacy Notes | $ 175,000 |  |  | 175,000
Stated interest rate | 6.875% |  |  |
Legacy Notes | 7.25% Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Legacy Notes | $ 300,000 |  |  | $ 300,000
Stated interest rate | 7.25% |  |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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