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SHORT-TERM AND LONG-TERM DEBT (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 NOK (kr) containership subsidiary Rate shares | Mar. 31, 2019 USD ($) subsidiary | Feb. 28, 2019 USD ($) subsidiary | Feb. 28, 2018 NOK (kr) | Aug. 31, 2014 USD ($) subsidiary | Jun. 30, 2019 NOK (kr) containership Rate shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 NOK (kr) subsidiary Rate | Dec. 31, 2018 USD ($) subsidiary | Jun. 30, 2019 USD ($) containership $ / shares Rate shares | Jun. 11, 2019 USD ($) | Jun. 04, 2019 NOK (kr) | Jun. 04, 2019 USD ($) | Dec. 31, 2018 USD ($) Rate | Sep. 30, 2018 containership | May 31, 2018 containership | May 04, 2018 USD ($) | Apr. 23, 2018 USD ($) $ / shares shares | Apr. 05, 2018 containership | Feb. 01, 2018 shares | Oct. 31, 2017 NOK (kr) | Oct. 05, 2016 | Mar. 19, 2014 NOK (kr) | Jan. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  | $ 11,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | $ 1,802,000 | $ 0 |  | $ 1,146,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 1,484,631,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt- Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  | 571,424,000 |  |  |  | $ 568,876,000 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 1,484,631,000 |  |  |  | 1,460,347,000 |  |  |  |  |  |  |  |  |  |
Deferred Finance Costs, Noncurrent, Net |  |  |  |  |  |  |  |  |  |  | (21,939,000) |  |  |  | (23,267,000) |  |  |  |  |  |  |  |  |  |
Less : current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | (188,029,000) |  |  |  | (267,149,000) |  |  |  |  |  |  |  |  |  |
Total long-term debt, non-current portion |  |  |  |  |  |  |  |  |  |  | 1,274,663,000 |  |  |  | $ 1,169,931,000 |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  | 217,338,000 | 553,000,000 |  | 825,984,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments and redemptions |  |  |  |  |  |  | (115,739,000) | (69,226,000) |  | (778,731,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of foreign exchange |  |  |  |  |  |  | 3,707,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 (remaining six months) |  |  |  |  |  |  |  |  |  |  | 76,104,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |  | 198,565,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  |  |  |  | 513,236,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  |  | 255,185,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  |  | 280,353,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  |  |  |  |  |  | 161,188,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 1,484,631,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (in hundredths) | Rate | 4.19% |  |  |  |  | 4.19% |  |  | 4.22% |  | 4.19% |  |  |  | 4.22% |  |  |  |  |  |  |  |  |  |
Three month dollar LIBOR rate (in hundredths) | Rate | 2.37% |  |  |  |  | 2.37% |  |  | 2.81% |  | 2.37% |  |  |  | 2.81% |  |  |  |  |  |  |  |  |  |
Three month Norwegian kroner NIBOR rate (in hundredths) | Rate | 1.52% |  |  |  |  | 1.52% |  |  | 1.27% |  | 1.52% |  |  |  | 1.27% |  |  |  |  |  |  |  |  |  |
Debt paid in cash |  |  |  |  |  |  | 196,761,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of container vessels | containership | 7 |  |  |  |  | 7 |  |  |  |  | 7 |  |  |  |  | 3 | 4 |  |  | 15 |  |  |  |  |
Issuable under a share lending arrangement (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Equity component of convertible bond issuance, net |  |  |  |  |  |  | 0 | 7,905,000 |  | 7,905,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of assets pledged under ship mortgages |  |  |  |  |  |  |  |  |  |  | $ 1,650,000,000 |  |  |  | $ 1,527,000,000 |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12.51 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of bonds |  |  |  |  |  |  | 80,749,000 | 63,218,000 |  | 97,248,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  |  |  |  |  | 300,000 | 0 |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Rate and Foreign Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  | 79,862,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 148,300,000 |  |  |  | 151,700,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 148,300,000 |  |  |  | 151,700,000 |  |  |  |  |  |  |  |  |  |
Shares issued on conversion of convertible debt | shares | 60.3956 |  |  |  |  | 60.3956 |  |  |  |  | 60.3956 |  |  |  |  |  |  |  | 52.8157 |  |  |  |  |  |
Principle debt amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000.0 | $ 150,000,000.0 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 16.56 |  |  |  |  |  |  |  | $ 18.93 |  |  |  |  |  |
Issued shares (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,765,842 |  |  |  |  |  |
Amortization of deferred charges |  |  |  |  |  |  | 300,000 | 300,000 |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium of Convertible Debt if Converted at Balance Sheet Date |  |  |  |  |  |  |  |  |  |  | $ 36,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of bonds |  |  |  |  |  |  | 3,400,000 |  |  | $ 12,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |
US dollar 33.1 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 33,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 33,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
US dollar 24.9 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 24,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 24,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
US dollar 29.5 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 29,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 29,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
US dollar 50 million secured term loan facility (VLCCs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Rate and Foreign Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments and redemptions |  |  |  |  |  |  | 81,021,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NOK 900 Million Senior Unsecured Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | kr 672,000,000 |  |  |  |  |  | 77,722,000 |  |  |  |  |  |  |  |  | kr 900,000,000 |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 672,000,000 |  |  |  |  |  | 77,722,000 |  |  |  |  |  |  |  |  | kr 900,000,000 |
Debt paid in cash | kr |  |  |  |  |  | kr 672,000,000 |  |  | kr 228,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NOK 600 Million Senior Unsecured Bond due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 70,298,000 |  |  |  | 69,395,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 70,298,000 |  |  |  | 69,395,000 |  |  |  |  |  |  |  |  |  |
Fixed Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of foreign exchange |  |  |  |  |  |  | 3,707,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25%
Debt paid in cash | kr |  |  |  | kr 63,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on conversion of convertible debt | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 651,365 |  |  |  |
Senior Unsecured Convertible Bonds Due 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
NOK 900 million senior unsecured floating rate bonds due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 212,230,000 |  |  |  | 212,230,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 212,230,000 |  |  |  | 212,230,000 |  |  |  |  |  |  |  |  |  |
Interest rate | 5.75% |  |  |  |  | 5.75% |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |
NOK500million senior unsecured floating rate bonds due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 58,582,000 |  |  |  | 57,829,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 58,582,000 |  |  |  | 57,829,000 |  |  |  |  |  |  |  |  |  |
Principle debt amount | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 500,000,000 |  |  |
Senior Unsecured Convertible Bonds due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 148,300,000 |  |  |  | 151,700,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 148,300,000 |  |  |  | 151,700,000 |  |  |  |  |  |  |  |  |  |
Interest rate | 4.875% |  |  |  |  | 4.875% |  |  |  |  | 4.875% |  |  |  |  |  |  |  | 4.875% |  |  |  | 4.875% |  |
Floating Rate Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt- Floating Interest Rate |  |  |  |  |  |  |  |  |  |  | $ 913,207,000 |  |  |  | 891,471,000 |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  | 137,476,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments and redemptions |  |  |  |  |  |  | 115,740,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of foreign exchange |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Debt [Member] | US dollar 101 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,100,000 | 44,100,000 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,100,000 | 44,100,000 |  |  |  |  |  |  |  |  |  |
Principle debt amount |  |  |  |  | $ 101,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Wholly Owned Subsidiaries Of Company That Entered Into Secured Term Loan Facility Agreement | subsidiary |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sold wholly owned subsidiaries of company that entered into secured term loan facility agreement | subsidiary |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Debt [Member] | US dollar 33.1 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle debt amount |  |  |  |  |  |  |  |  |  |  |  | $ 33,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Wholly Owned Subsidiaries Of Company That Entered Into Secured Term Loan Facility Agreement | subsidiary | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Debt [Member] | US dollar 24.9 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle debt amount |  |  | $ 24,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Wholly Owned Subsidiaries Of Company That Entered Into Secured Term Loan Facility Agreement | subsidiary |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Debt [Member] | US dollar 29.5 million secured term loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle debt amount |  | $ 29,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Wholly Owned Subsidiaries Of Company That Entered Into Secured Term Loan Facility Agreement | subsidiary |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Debt [Member] | US dollar 50 million secured term loan facility (VLCCs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle debt amount |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Wholly Owned Subsidiaries Of Company That Entered Into Secured Term Loan Facility Agreement | subsidiary |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NOK 700 Million Senior Unsecured Bond due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | kr 700,000,000 |  |  |  |  | kr 700,000,000 |  |  |  |  | 82,014,000 |  | kr 700,000,000 |  | 0 |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | kr 700,000,000 |  |  |  |  | kr 700,000,000 |  |  |  |  | $ 82,014,000 |  | kr 700,000,000 |  | $ 0 |  |  |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] | Senior Unsecured Convertible Bonds due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of convertible bond issuance, net |  |  |  |  |  |  | $ 0 | $ 7,905,000 |  | $ 7,906,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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