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INCOME TAXES - Provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income before income taxes |  |  |
Income (loss) before income taxes | $ 145,263 | $ 208,621 | $ 304,400
Current tax |  |  |
Current tax expense (benefit) | 22,255 | 56,685 | 18,375
Deferred tax |  |  |
Deferred tax expense (benefit) | (24,238) | (14,619) | 43,594
Total income tax expense |  |  |
Total income tax expense (benefit) | (1,983) | 42,066 | 61,969
Canada |  |  |
Income before income taxes |  |  |
Income (loss) before income taxes | (31,896) | (61,880) | 10,570
Current tax |  |  |
Current tax expense (benefit) | 36,226 | (3,420) | (1,846)
Deferred tax |  |  |
Deferred tax expense (benefit) | (10,792) | (6,558) | 12,117
Total income tax expense |  |  |
Total income tax expense (benefit) | 25,434 | (9,978) | 10,271
United States |  |  |
Income before income taxes |  |  |
Income (loss) before income taxes | (113,262) | 8,319 | 61,377
Current tax |  |  |
Current tax expense (benefit) | (71,421) | (4,803) | (14,786)
Deferred tax |  |  |
Deferred tax expense (benefit) | 23,173 | (2,412) | 32,696
Total income tax expense |  |  |
Total income tax expense (benefit) | (48,248) | (7,215) | 17,910
PRC |  |  |
Income before income taxes |  |  |
Income (loss) before income taxes | 189,398 | 204,632 | 178,050
Current tax |  |  |
Current tax expense (benefit) | 30,276 | 44,622 | 27,285
Deferred tax |  |  |
Deferred tax expense (benefit) | (17,998) | (5,333) | 2,653
Total income tax expense |  |  |
Total income tax expense (benefit) | 12,278 | 39,289 | 29,938
Japan |  |  |
Income before income taxes |  |  |
Income (loss) before income taxes | 50,642 | 29,335 | 27,555
Current tax |  |  |
Current tax expense (benefit) | 18,941 | 13,229 | 5,325
Deferred tax |  |  |
Deferred tax expense (benefit) | (10,571) | (2,953) | (3,381)
Total income tax expense |  |  |
Total income tax expense (benefit) | 8,370 | 10,276 | 1,944
Others |  |  |
Income before income taxes |  |  |
Income (loss) before income taxes | 50,381 | 28,215 | 26,848
Current tax |  |  |
Current tax expense (benefit) | 8,233 | 7,057 | 2,397
Deferred tax |  |  |
Deferred tax expense (benefit) | (8,050) | 2,637 | (491)
Total income tax expense |  |  |
Total income tax expense (benefit) | $ 183 | $ 9,694 | $ 1,906

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