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SHORT-TERM AND LONG-TERM DEBT (Movement) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |
Long term debt, beginning of the period | $ 593,257 |
Total debt principal, beginning period | 1,663,394 |
Drawdowns | 252,000 | $ 347,231
Repayments and redemptions | (218,977) |
Effects of foreign exchange | (924) |
Long term debt, end of period | 675,022 |
Total debt principal, ending period | 1,695,493 |
7.25% Senior Unsecured Sustainability-Linked Bonds Due 2026 |  |
Debt Instrument [Line Items] |  |
Drawdowns | 150,000 |
U.S. Dollar Floating Rate Debt |  |
Debt Instrument [Line Items] |  |
Long term debt with floating interest rate, beginning of period | 1,070,137 |
Drawdowns | 102,000 |
Repayments and redemptions | (151,666) |
Effects of foreign exchange | 0 |
Long term debt with floating interest rate, end of period | 1,020,471 |
Fixed Rate and Foreign Debt |  |
Debt Instrument [Line Items] |  |
Repayments and redemptions | (67,311) |
Effects of foreign exchange | $ (924) |

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- Definition Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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