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DEBT (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2017 | Feb. 28, 2017 | Dec. 31, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,701,341,000 | $ 1,740,552,000 |  |  |  |  |  |  |  |  |
Total U.S. dollar denominated floating rate debt | 1,553,905,000 | 1,524,995,000 |  |  |  |  |  |  |  |  |
Total U.S. dollar denominated fixed rate debt | 120,000,000 | 186,000,000 |  |  |  |  |  |  |  |  |
Credit facilities | 23,000 | 32,000 |  |  |  |  |  |  |  |  |
Secured borrowings | 7,329,000 | 7,631,000 |  |  |  |  |  |  |  |  |
Promissory notes | 20,084,000 | 21,894,000 |  |  |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt | 438,962,000 | 120,479,000 |  |  |  |  |  |  |  |  |
Deferred charges | 7,962,000 | 9,780,000 |  |  |  |  |  |  |  |  |
Long-term portion of debt | 1,254,417,000 | 1,610,293,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
2020 | 438,962,000 |  |  |  |  |  |  |  |  |  |
2021 | 558,928,000 |  |  |  |  |  |  |  |  |  |
2022 | 57,808,000 |  |  |  |  |  |  |  |  |  |
2023 | 219,290,000 |  |  |  |  |  |  |  |  |  |
2024 | 125,077,000 |  |  |  |  |  |  |  |  |  |
Thereafter | 301,276,000 |  |  |  |  |  |  |  |  |  |
Total debt | 1,701,341,000 | 1,740,552,000 |  |  |  |  |  |  |  |  |
Assets pledged [Abstract] |  |  |  |  |  |  |  |  |  |  |
Vessels, net | 2,579,905,000 | 2,476,755,000 |  |  |  |  |  |  |  |  |
Deferred Charges [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt arrangement fees | 16,831,000 | 17,490,000 |  |  |  |  |  |  |  |  |
Accumulated amortization | (8,869,000) | (7,710,000) |  |  |  |  |  |  |  |  |
Deferred charges | 7,962,000 | 9,780,000 |  |  |  |  |  |  |  |  |
Vessels |  |  |  |  |  |  |  |  |  |  |
Assets pledged [Abstract] |  |  |  |  |  |  |  |  |  |  |
Vessels, net | 2,578,135,000 | 2,475,649,000 |  |  |  |  |  |  |  |  |
$500.1 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 500,100,000.0 |  |  |  |  |  |  |  |  |  |
$60.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 60,600,000.0 |  |  |  |  |  |  |  |  |  |
$466.5 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 466,500,000.0 |  |  |  |  |  |  |  |  |  |
$109.2 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 109,200,000.0 |  |  |  |  |  |  |  |  |  |
$328.4 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 328,400,000.0 |  |  |  |  |  |  |  |  |  |
$321.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 321,600,000.0 |  |  | $ 321,600,000.0 |  |  |  |  |  |  |
$110.5 million term loan facility (ING) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 110,500,000.0 |  | $ 110,500,000.0 |  |  |  |  |  |  |  |
$110.5 million term loan facility (Credit Suisse) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 110,500,000.0 |  |  |  |  |  |  |  |  |  |
$110.5 million term loan facility (Credit Suisse 2) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 110,500,000.0 |  | 110,500,000.0 |  |  |  |  |  |  |  |
$275.0 million revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | 270,000,000.0 |  |  |  |  |  |  |  |  |  |
Loans Payable | $500.1 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500,100,000.0 |  |
Loans Payable | $60.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 60,600,000.0 |
Loans Payable | $466.5 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 466,500,000.0
Loans Payable | $109.2 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 109,200,000.0 |  |  |  |
Loans Payable | $328.4 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 328,400,000.0 |  |  |  |  |
Loans Payable | $321.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 321,600,000.0 |  |  |  |  |  |  |
Loans Payable | $110.5 million term loan facility (Credit Suisse 2) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 110,500,000.0 |  |  |  |  |  |  |  |
Loans Payable | $275.0 million revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 275,000,000.0 |  |  |
Total debt | 120,000,000 | 186,000,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 120,000,000 | 186,000,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | $466.5 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 466,500,000 |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 466,500,000 |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $500.1 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 347,689,000 | 385,792,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 347,689,000 | 385,792,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $60.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 44,126,000 | 47,594,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 44,126,000 | 47,594,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $466.5 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 264,752,000 | 281,273,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 264,752,000 | 281,273,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $109.2 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 89,929,000 | 96,353,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 89,929,000 | 96,353,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $328.4 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 230,805,000 | 246,079,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 230,805,000 | 246,079,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $321.6 million term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 241,127,000 | 260,108,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 241,127,000 | 260,108,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $110.5 million term loan facility (ING) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 106,189,000 | 51,413,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 106,189,000 | 51,413,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $110.5 million term loan facility (Credit Suisse) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 112,190,000 | 103,747,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | 112,190,000 | 103,747,000 |  |  |  |  |  |  |  |  |
US Dollar denominated floating rate debt | Loans Payable | $110.5 million term loan facility (Credit Suisse 2) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt | 117,098,000 | 52,636,000 |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 117,098,000 | $ 52,636,000 |  |  |  |  |  |  |  |  |

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