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INCOME TAXES - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income before income taxes      
Income before income taxes $ 83,251 $ 222,828 $ 321,318
Current tax      
Current tax 119,875 138,353 46,739
Deferred tax      
Deferred tax (101,899) (88,841) 30,692
Total income tax expense      
Total income tax expense 17,976 49,512 77,431
Canada      
Income before income taxes      
Income before income taxes 57,922 79,631 248,666
Current tax      
Current tax 610 71,002 17,721
Deferred tax      
Deferred tax 6,366 (44,548) 40,895
Total income tax expense      
Total income tax expense 6,976 26,454 58,616
United States      
Income before income taxes      
Income before income taxes (74,002) (14,183) 12,009
Current tax      
Current tax 96,172 40,567 18,702
Deferred tax      
Deferred tax (74,562) (45,024) (14,928)
Total income tax expense      
Total income tax expense 21,610 (4,457) 3,774
PRC      
Income before income taxes      
Income before income taxes 133,847 134,330 50,746
Current tax      
Current tax 29,339 20,145 7,559
Deferred tax      
Deferred tax (10,880) 7,506 10,827
Total income tax expense      
Total income tax expense 18,459 27,651 18,386
Others      
Income before income taxes      
Income before income taxes (34,516) 23,050 9,897
Current tax      
Current tax (6,246) 6,639 2,757
Deferred tax      
Deferred tax (22,823) (6,775) (6,102)
Total income tax expense      
Total income tax expense $ (29,069) $ (136) $ (3,345)