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RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Details) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period $ 2,237,422 $ 1,771,727 $ 1,755,947
Net (loss) income (151,988) (46,362) 109,555
Dividends (161,824) (155,996) (108,976)
Exercise of share options 225 1,338 608
Grant of share options 6,358 1,619 500
Net proceeds from issuance of shares   660,947  
Forfeiture of share options (2,521)    
Cancellation of share options 786    
Transfer of additional paid-in capital 1,579    
Other comprehensive income (loss) (1,589) 4,149 14,093
Treasury shares (12,269)    
Balance at end of the period 1,916,179 2,237,422 1,771,727
As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 2,282,507    
Net (loss) income (178,501) (41,466) 135,713
Other comprehensive income (loss) (42,001) 11,928 11,973
Balance at end of the period 1,894,339 2,282,507  
Adjustment      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period (45,085)    
Net (loss) income 26,513 (4,896) (26,158)
Other comprehensive income (loss) 40,412 (7,779) 2,120
Balance at end of the period 21,840 (45,085)  
Share Capital      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 93,415 80,580 80,504
Exercise of share options 132 185 76
Net proceeds from issuance of shares   12,650  
Balance at end of the period 93,547 93,415 80,580
Treasury Shares      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 0 0 0
Treasury shares (12,269)    
Balance at end of the period (12,269) 0 0
Additional Paid-in Capital      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 1,307,087 656,018 654,042
Exercise of share options 93 1,153 1,476
Grant of share options 6,358 1,619 500
Net proceeds from issuance of shares   648,297  
Forfeiture of share options (2,521)    
Cancellation of share options 786    
Transfer of additional paid-in capital 6,003    
Balance at end of the period 1,317,806 1,307,087 656,018
Contributed Surplus      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 200,000 200,000 200,000
Balance at end of the period 200,000 200,000 200,000
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period (6,579) (10,728) (24,821)
Transfer of additional paid-in capital (4,424)    
Other comprehensive income (loss) (1,589) 4,149 14,093
Balance at end of the period (12,592) (6,579) (10,728)
Accumulated Other Comprehensive Loss | As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 5,171 (6,757) (18,730)
Transfer of additional paid-in capital (4,424)    
Other comprehensive income (loss) (42,001) 11,928 11,973
Balance at end of the period (41,254) 5,171 (6,757)
Accumulated Other Comprehensive Loss | Adjustment      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period (11,750) (3,971) (6,091)
Other comprehensive income (loss) 40,412 (7,779) 2,120
Balance at end of the period 28,662 (11,750) (3,971)
Accumulated Earnings      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 641,844 845,857 846,222
Net (loss) income (171,146) (48,017) 109,555
Dividends (161,824) (155,996) (108,976)
Exercise of share options     (944)
Balance at end of the period 308,874 641,844 845,857
Accumulated Earnings | As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 675,179 874,296 848,503
Net (loss) income (197,659) (43,121) 135,713
Dividends (161,824) (155,996) (108,976)
Exercise of share options     (944)
Balance at end of the period 315,696 675,179 874,296
Accumulated Earnings | Adjustment      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period (33,334) (28,439) (2,281)
Net (loss) income 26,513 (4,896) (26,158)
Balance at end of the period (6,822) (33,334) (28,439)
Non-controlling Interest      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of the period 1,655 0 0
Net (loss) income 19,158 1,655  
Balance at end of the period $ 20,813 $ 1,655 $ 0