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LONG-TERM DEBT (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Apr. 07, 2017 | Dec. 31, 2016
--- | --- | --- | ---
LONG-TERM DEBT |  |  |
Total debt | $ 1,371,851 |  | $ 1,202,686
Less: current portion |  |  | 129,896
Long-term debt | 1,371,851 |  | 1,072,790
Credit Facility |  |  |
LONG-TERM DEBT |  |  |
Total debt | (6,181) |  | (6,416)
Outstanding borrowings | 0 |  | 0
Letters of credit |  |  |
LONG-TERM DEBT |  |  |
Total debt | 800 |  |
2017 Notes |  |  |
LONG-TERM DEBT |  |  |
Total debt | 297,784 |  |
2016 Notes |  |  |
LONG-TERM DEBT |  |  |
Total debt | 348,002 |  | 347,716
2015 Note |  |  |
LONG-TERM DEBT |  |  |
Total debt | 49,495 |  | 49,429
2012 Notes |  |  |
LONG-TERM DEBT |  |  |
Total debt | 199,063 |  | 198,894
2010 Notes |  |  |
LONG-TERM DEBT |  |  |
Total debt | $ 483,688 |  | 598,167
Outstanding borrowings |  | $ 485,000 |
Other attributable debt instruments |  |  |
LONG-TERM DEBT |  |  |
Total debt |  |  | $ 14,896

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