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INCOME TAXES - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income before income taxes      
Income before income taxes $ 208,621 $ 304,400 $ 143,934
Current tax      
Current tax 56,685 18,375 (38,261)
Deferred tax      
Deferred tax (14,619) 43,594 79,212
Total income tax expense      
Total income tax expense 42,066 61,969 40,951
Canada      
Income before income taxes      
Income before income taxes (61,880) 10,570 (30,524)
Current tax      
Current tax (3,420) (1,846) 346
Deferred tax      
Deferred tax (6,558) 12,117 (6,464)
Total income tax expense      
Total income tax expense (9,978) 10,271 (6,118)
United States      
Income before income taxes      
Income before income taxes 8,319 61,377 (33,205)
Current tax      
Current tax (4,803) (14,786) (54,482)
Deferred tax      
Deferred tax (2,412) 32,696 67,426
Total income tax expense      
Total income tax expense (7,215) 17,910 12,944
PRC      
Income before income taxes      
Income before income taxes 204,632 178,050 173,266
Current tax      
Current tax 44,622 27,285 (7,383)
Deferred tax      
Deferred tax (5,333) 2,653 23,452
Total income tax expense      
Total income tax expense 39,289 29,938 16,069
Japan      
Income before income taxes      
Income before income taxes 29,335 27,555 28,164
Current tax      
Current tax 13,229 5,325 31,266
Deferred tax      
Deferred tax (2,953) (3,381) (4,499)
Total income tax expense      
Total income tax expense 10,276 1,944 26,767
Others      
Income before income taxes      
Income before income taxes 28,215 26,848 6,233
Current tax      
Current tax 7,057 2,397 (8,008)
Deferred tax      
Deferred tax 2,637 (491) (703)
Total income tax expense      
Total income tax expense $ 9,694 $ 1,906 $ (8,711)