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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Sep. 19, 2018 | Feb. 01, 2018 | Dec. 07, 2017 | Apr. 16, 2014
Fair Value Disclosures [Abstract] |  |  |  |  |  |  |  |
Fair value of debt |  |  | $ 4,000,000,000 | $ 4,000,000,000 |  |  |  |
Steward Health Care Systems, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  |  |  | $ 4,000,000
Shiel Holdings LLC (Shiel) [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  |  | $ 6,000,000 |
Contingent consideration arrangements, range of outcomes, value, high |  |  | $ 15,000,000 |  |  |  |  |
Comparable company revenue volatility |  |  | 6.90% |  |  |  |  |
Discount rate |  |  | 4.50% |  |  |  |  |
Shiel Holdings LLC (Shiel) [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  | $ 6,000,000 | 7,000,000 |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  |  | $ 30,000,000 |  |
Comparable company revenue volatility |  | 12.70% |  |  |  |  |  |
Discount rate |  | 5.40% |  |  |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  | $ 0 |  | $ 12,000,000 |  |
ReproSource, Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  | $ 10,000,000 |  |  |
Comparable company revenue volatility | 8.50% |  |  |  |  |  |  |
Discount rate | 6.50% |  |  |  |  |  |  |
ReproSource, Inc. [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  | $ 5,000,000 |  |  |

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