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FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 30, 2017 | Jun. 30, 2019 USD ($) containership Rate | Jun. 30, 2018 Rate | Dec. 31, 2018 USD ($) Rate | Jun. 30, 2019 NOK (kr) | Jun. 30, 2019 vessel | Jun. 30, 2019 | Jun. 30, 2019 USD ($) | Jun. 04, 2019 NOK (kr) | Apr. 30, 2019 Rate | Sep. 13, 2018 NOK (kr) | Jul. 31, 2018 Rate | Apr. 23, 2018 | Oct. 31, 2017 NOK (kr) | Sep. 12, 2017 subsidiary Rate | Oct. 05, 2016
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Current |  |  |  | $ 5,279,000 |  |  |  | $ 0 |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | 900,000,000 |  |  |  | 900,000,000 |  |  |  |  |  |  |  |
Agreed Proportion of temporary reduction to daily charter rate | Rate |  |  |  |  |  |  |  |  |  | 100.00% |  | 50.00% |  |  |  |
Loans to related parties which are associates |  |  |  | 310,144,000 |  |  |  | 312,660,000 |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |  | 10,633,000 |  |  |  | 2,597,000 |  |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 45,047,000 |  |  |  | 4,390,000 |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |  | 16,213,000 |  |  |  | 16,713,000 |  |  |  |  |  |  |  |
NOK500million senior unsecured floating rate bonds due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | kr |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 500,000,000 |  |
NOK600million senior unsecured floating rate bonds due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | kr |  |  |  |  |  |  |  |  |  |  | kr 600,000,000 |  |  |  |  |
NOK700million senior unsecured floating rate bonds due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | kr |  |  |  |  |  |  |  |  | kr 700,000,000 |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  | 5.75%
Senior Unsecured Convertible Bonds due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.875% |  |  |  |  |  | 4.875% |  |  | 4.875%
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Receivables, Non Designated Options To Extend Interest Rate Swaps |  |  |  | 5,200,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Swap Contracts, Short Term Payables, Fair Value Disclosure |  |  |  | 12,000,000.0 |  |  |  | 0 |  |  |  |  |  |  |  |
Long Term Payables, Non Designated Interest Rate Swaps |  |  |  | $ 100,000 |  |  |  | 1,900,000 |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Evergreen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 15.00% | 3.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Maersk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 31.00% | 26.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | MSC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 14.00% | 11.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | Rate |  | 4.00% | 10.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Golden Ocean [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 11.00% | 14.00% | 13.00% |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk Benchmark, Net Income [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | Rate |  | 26.00% | 36.00% | 39.00% |  |  |  |  |  |  |  |  |  |  |  |
Equity Accounted Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  |  | $ 266,100,000 |  |  |  | 266,100,000 |  |  |  |  |  |  |  |
Frontline Shipping [Member] | Frontline [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Seadrill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans to related parties which are associates |  |  |  | 342,000,000.0 |  |  |  | 319,000,000.0 |  |  |  |  |  |  |  |
Frontline Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee Compliance, Minimum Free Cash |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Related Party Transactions Daily Vessel Management Fee |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seadrill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of wholly-owned subsidiaries that own drilling units accounted for using the equity method | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Agreed Proportion of temporary reduction to daily charter rate | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.00% |
Agreed Temporary Reduction in Daily Time Charter Rates, Period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed Period of Charter Extension following Amendments | 13 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of drilling rigs owned by wholly-owned subsidiaries account for using the equity method | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Agreed period of extension to bank loan term | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Evergreen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of container vessels | containership |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maersk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of container vessels | containership |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MSC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of container vessels |  | 29 |  |  |  | 19 |  |  |  |  |  |  |  |  |  |
Golden Ocean [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units | vessel |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract 4 [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | kr 500,000,000 |  |  | 64,000,000.0 |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Current |  |  |  | 5,279,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 12,043,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 33,004,000 |  |  |  | 4,390,000 |  |  |  |  |  |  |  |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |  | 5,174,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |  | 86,000 |  |  |  | 1,901,000 |  |  |  |  |  |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |  | 5,459,000 |  |  |  | 2,597,000 |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |  | 1,811,000 |  |  |  | 5,859,000 |  |  |  |  |  |  |  |
Cross Currency Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |  | 4,709,000 |  |  |  | 8,953,000 |  |  |  |  |  |  |  |
Cross Currency Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |  | $ 9,607,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract 6 [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | 600,000,000 |  |  | 76,800,000 |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract 7 [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | kr 700,000,000 |  |  | $ 80,500,000 |  |  |  |  |  |  |  |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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