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LONG-TERM DEBT - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Issuance Costs |  |  |
Costs associated with the issuance of debt capitalized | $ 4,005 | $ 16,823 |
Unamortized debt issuance costs | 11,600 |  | $ 8,300
Senior Revolving Credit Facility , 2025 notes and additional 2025 notes |  |  |
Debt Issuance Costs |  |  |
Costs associated with the issuance of debt capitalized | $ 3,900 |  |

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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