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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2016
FAIR VALUE MEASUREMENT |
Schedule of financial assets and liabilities measured at fair value on a recurring basis |
|  | Fair Value Measurements Using |
At December 31, 2016 |  | Total Fair Value and Carrying Value on the Balance Sheets |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
|  | $ |  | $ |  | $ |  | $ |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange forward contracts |  |  | 10,632 |  |  | — |  |  | 10,632 |  |  | — |
Commodity hedge |  |  | 4,230 |  |  | — |  |  | 4,230 |  |  | — |
Interest rate swap |  |  | 12,854 |  |  | — |  |  | 12,854 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets |  |  | 27,716 |  |  | — |  |  | 27,716 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: |  |  |  |  |  | — |  |  |  |  |  | — |
Interest rate swap |  |  | 5,418 |  |  | — |  |  | 5,418 |  |  | — |
Warrants |  |  | 711 |  |  | — |  |  | 711 |  |  | — |
Foreign exchange forward contracts |  |  | 3,496 |  |  | — |  |  | 3,496 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total liabilities |  |  | 9,625 |  |  | — |  |  | 9,625 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Fair Value Measurements Using |
At December 31, 2015 |  | Total Fair Value and Carrying Value on the Balance Sheets |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
|  | $ |  | $ |  | $ |  | $ |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange forward contracts |  |  | 1,924 |  |  | — |  |  | 1,924 |  |  | — |
Commodity hedge |  |  | 2,072 |  |  | — |  |  | 2,072 |  |  | — |
Interest rate swaption |  |  | 4,335 |  |  | — |  |  | 4,335 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets |  |  | 8,331 |  |  | — |  |  | 8,331 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  | 21,546 |  |  | — |  |  | 21,546 |  |  | — |
Warrants |  |  | 25,265 |  |  | — |  |  | 25,265 |  |  | — |
Foreign exchange forward contracts |  |  | 5,775 |  |  | — |  |  | 5,775 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total liabilities |  |  | 52,586 |  |  | — |  |  | 52,586 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of fair value of derivative instruments on the consolidated balance sheets |
|  | Fair Value of Derivative Assets |
|  | At December 31, 2015 |  | At December 31, 2016 |
|  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
|  |  |  | $ |  |  |  | $ |
Foreign exchange forward contracts |  | Derivative assets—current |  |  | 1,924 |  | Derivative assets—current |  |  | 10,632 |
Commodity hedge |  | Derivative assets—current |  |  | — |  | Derivative assets—current |  |  | 1,638 |
Interest rate swaption |  | Derivative assets—current |  |  | 4,335 |  | Derivative assets—current |  |  | — |
Commodity hedge |  | Derivative assets—non-current |  |  | 2,072 |  | Derivative assets—non-current |  |  | 2,592 |
Interest rate swap |  | Derivative assets—non-current |  |  | — |  | Derivative assets—non-current |  |  | 12,854 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Total |  |  | 8,331 |  | Total |  |  | 27,716 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Fair Value of Derivative Liabilities |
|  | At December 31, 2015 |  | At December 31, 2016 |
|  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
|  |  |  | $ |  |  |  | $ |
Foreign exchange forward contracts |  | Derivative liabilities—current |  |  | 5,775 |  | Derivative liabilities—current |  |  | 3,496 |
Warrants |  | Derivative liabilities—current |  |  | 25,265 |  | Derivative liabilities—current |  |  | 711 |
Interest rate swap |  | Derivative liabilities—current |  |  | 4,188 |  | Derivative liabilities—current |  |  | 5,418 |
Interest rate swap |  | Derivative liabilities—non-current |  |  | 17,358 |  | Derivative liabilities—non-current |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Total |  |  | 52,586 |  | Total |  |  | 9,625 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of effect of derivative instruments on consolidated statements of operations |
|  |  |  | Amount of Gain (Loss) Recognized in Statements of Operations |
|  |  |  | Years Ended December 31 |
|  | Location of Gain (Loss) Recognized in Statements of Operations |
|  | 2014 |  | 2015 |  | 2016 |
|  |  |  | $ |  | $ |  | $ |
Foreign exchange forward contracts |  | Gain (loss) on change in fair value of derivatives |  |  | 19,656 |  |  | (3,738 | ) |  | 4,798 |
Warrants |  | Gain (loss) on change in fair value of derivatives |  |  | — |  |  | (8,887 | ) |  | 24,554 |
Commodity hedge |  | Gain (loss) on change in fair value of derivatives |  |  | — |  |  | (7 | ) |  | 75 |
Interest rate swaption |  | Gain (loss) on change in fair value of derivatives |  |  | — |  |  | (107 | ) |  | (4,335 | )
Interest rate swap |  | Gain (loss) on change in fair value of derivatives |  |  | — |  |  | 543 |  |  | 2,230 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Total |  |  | 19,656 |  |  | (12,196 | ) |  | 27,322 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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