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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
FAIR VALUE MEASUREMENT |  |
Transfers of financial assets from level 1 to 2 | $ 0 |
Transfers of financial assets from level 2 to 1 | 0 |
Transfers of financial assets into 3 | 0 |
Transfers of financial assets from 3 | 0 |
Transfers of financial liabilities from level 1 to 2 | 0 |
Transfers of financial liabilities from level 2 to 1 | 0 |
Transfers of financial liabilities into 3 | 0 |
Transfers of financial liabilities from 3 | 0 |
Long term debt |  |
FAIR VALUE MEASUREMENT |  |
Total financial liabilities | 1,499,400 | $ 1,319,700
Fair value measurement at Recurring basis |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 152,015 | 100,859
Total financial liabilities |  | 1,120
Fair value measurement at Recurring basis | Fair value of derivative financial instruments |  |
FAIR VALUE MEASUREMENT |  |
Total financial liabilities |  | 1,120
Fair value measurement at Recurring basis | Trade receivables |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 12,000 | 8,185
Fair value measurement at Recurring basis | Availableforsale securities |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 122,775 | 92,310
Fair value measurement at Recurring basis | Fair value of derivative financial instruments |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 17,240 | 364
Fair value measurement at Recurring basis | Level 1 |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 110,664 | 86,736
Fair value measurement at Recurring basis | Level 1 | Availableforsale securities |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 110,664 | 86,736
Fair value measurement at Recurring basis | Level 2 |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 41,351 | 14,123
Total financial liabilities |  | 1,120
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments |  |
FAIR VALUE MEASUREMENT |  |
Total financial liabilities |  | 1,120
Fair value measurement at Recurring basis | Level 2 | Trade receivables |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 12,000 | 8,185
Fair value measurement at Recurring basis | Level 2 | Availableforsale securities |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | 12,111 | 5,574
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments |  |
FAIR VALUE MEASUREMENT |  |
Total financial assets | $ 17,240 | $ 364

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