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FAIR VALUE (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | May 31, 2019
--- | --- | --- | --- | ---
Liabilities |  |  |  |
Fair value of long-term obligations | $ 1,100,000 | $ 1,100,000 |  |
Noble Acquisition |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation | 4,200 |  | $ 2,900 |
Gateway Acquisition |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation |  |  |  | $ 3,000
Level 3 |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation | 31,140 | 5,930 |  |
Level 3 | Fusion Acquisition |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation | 26,910 | 0 |  |
Level 3 | Noble Acquisition |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation | 4,230 | 2,930 |  |
Level 3 | Gateway Acquisition |  |  |  |
Liabilities |  |  |  |
Contingent consideration obligation | 0 | 3,000 |  |
Fair Value, Recurring | Level 1 |  |  |  |
Assets |  |  |  |
Foreign exchange contracts | 0 | 0 |  |
Cross currency swap contract | 0 | 0 |  |
Total assets at fair value | 0 | 0 |  |
Liabilities |  |  |  |
Foreign exchange contracts | 0 | 0 |  |
Cross currency swap contract | 0 |  |  |
Contingent consideration obligation | 0 | 0 |  |
Total liabilities at fair value | 0 | 0 |  |
Fair Value, Recurring | Level 2 |  |  |  |
Assets |  |  |  |
Foreign exchange contracts | 322 | 206 |  |
Cross currency swap contract | 0 | 2,552 |  |
Total assets at fair value | 322 | 2,758 |  |
Liabilities |  |  |  |
Foreign exchange contracts | 146 | 401 |  |
Cross currency swap contract | 8,309 |  |  |
Contingent consideration obligation | 0 | 0 |  |
Total liabilities at fair value | 8,455 | 401 |  |
Fair Value, Recurring | Level 3 |  |  |  |
Assets |  |  |  |
Foreign exchange contracts | 0 | 0 |  |
Cross currency swap contract | 0 | 0 |  |
Total assets at fair value | 0 | 0 |  |
Liabilities |  |  |  |
Foreign exchange contracts | 0 | 0 |  |
Cross currency swap contract | 0 |  |  |
Contingent consideration obligation | 31,140 | 5,930 |  |
Total liabilities at fair value | 31,140 | 5,930 |  |
Estimate of Fair Value Measurement | Fair Value, Recurring |  |  |  |
Assets |  |  |  |
Foreign exchange contracts | 322 | 206 |  |
Cross currency swap contract | 0 | 2,552 |  |
Total assets at fair value | 322 | 2,758 |  |
Liabilities |  |  |  |
Foreign exchange contracts | 146 | 401 |  |
Cross currency swap contract | 8,309 |  |  |
Contingent consideration obligation | 31,140 | 5,930 |  |
Total liabilities at fair value | $ 39,595 | $ 6,331 |  |

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