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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Apr. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 06, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Transaction and reorganization expenses |  |  | $ 21,000,000 | $ 6,000,000 | $ 27,000,000 | $ 0 | $ 0 |
Goodwill |  |  | 102,003,000 |  | 102,003,000 | 47,148,000 |  |
Bargain purchase gain |  |  |  |  | 15,044,000 | $ 0 | $ 0 |
Novae |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interests acquired | 100.00% |  |  |  |  |  |  |
Total purchase price paid | $ 616,926,000 |  |  |  |  |  |  |
Transaction and reorganization expenses |  |  |  |  | 27,000,000 |  |  |
Goodwill | 54,047,000 |  |  |  |  |  |  |
Finite lived other intangible assets | 385,405,000 |  |  |  |  |  |  |
Value of business acquired | $ 257,000,000 |  |  |  |  |  |  |
Weighted average useful life | 7 years |  |  |  |  |  |  |
Indefinite lived intangible assets | $ 94,748,000 |  |  |  |  |  |  |
Total liabilities assumed | 3,342,912,000 |  |  |  |  |  |  |
Novae | Distribution networks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite lived other intangible assets | $ 128,463,000 |  |  |  |  |  |  |
Aviabel |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interests acquired |  | 100.00% |  |  |  |  |  |
Assets |  | $ 182,000,000 |  |  |  |  |  |
Total liabilities assumed |  | 79,000,000 |  |  |  |  |  |
Bargain purchase gain |  | $ 15,000,000 |  |  |  |  |  |
Contessa Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interests acquired |  |  |  |  |  |  |  | 100.00%
Goodwill |  |  | $ 1,000,000 |  | $ 1,000,000 |  |  |

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