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FAIR VALUE MEASUREMENTS - Estimated FV (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 07, 2017 | Feb. 16, 2017
--- | --- | --- | --- | ---
Fair value measurements |  |  |  |
Principal amount | $ 625,005 | $ 425,005 |  |
6.75% senior notes due 2025 |  |  |  |
Fair value measurements |  |  |  |
Interest rate (as a percent) | 6.75% | 6.75% | 6.75% | 6.75%
Principal amount |  |  | $ 850,000 | $ 850,000
Total |  |  |  |
Fair value measurements |  |  |  |
Estimated fair value of debt | $ 584,380 | $ 443,790 |  |

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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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- 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. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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