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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 12, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Jun. 16, 2017
Dec. 31, 2007
Authorized Shares [Roll forward]                
Balance at beginning of period (in shares)     180,000,000          
Balance at end of period (in shares)     180,000,000 180,000,000        
Issued and Outstanding Shares [Roll forward]                
Balance at beginning of period, issued (in shares)     101,969,666          
Balance at beginning of period, outstanding (in shares)     101,969,666          
Common Shares Issued in Follow-on Offering (in shares)     0          
Balance at end of period, issued (in shares)     141,969,666 101,969,666        
Balance at end of period, outstanding (in shares)     141,969,666 101,969,666        
Common Stock [Roll forward]                
Equity incentive plan issuance       $ 1        
Common Shares Issued in Follow-on Offering, value     $ 103,748 120,069        
Common Stock [Abstract]                
Net proceeds from underwritten public offering of common shares   $ 120,100 103,748 120,068 $ 0      
Additional Paid in Capital [Abstract]                
Share premium fund     103,400 215,500        
Reduction of share premium $ 215,500              
Contributed Surplus Account [Abstract]                
Dividend paid     59,100 125,700        
Contribution to surplus account     $ 796,800 $ 640,500        
Shareholders' Rights Plan [Abstract]                
Preferred share purchase right     one preferred stock purchase right to purchase one one-thousandth of a share of our Series A Participating Preferred Stock for each outstanding share of its common stock, par value $0.01 per share          
Common Share, par value (in dollars per share)     $ 0.01 $ 0.01     $ 0.01 $ 0.01
Shareholders rights, exercise price (in dollars per share)             $ 30 $ 115
Percentage of common share ownership             15.00% 15.00%
Shares issued under dividend reinvestment plan (in shares)           1,664,450    
Common Stock [Member]                
Authorized Shares [Roll forward]                
Balance at beginning of period (in shares)     180,000,000 180,000,000 180,000,000      
Balance at end of period (in shares)     180,000,000 180,000,000 180,000,000      
Issued and Outstanding Shares [Roll forward]                
Balance at beginning of period, issued (in shares)     101,969,666 89,182,001 89,182,001      
Balance at beginning of period, outstanding (in shares)     101,969,666 89,182,001 89,182,001      
Equity incentive plan issuance (in shares)       137,665        
Common Shares Issued in Follow-on Offering (in shares)     40,000,000 12,650,000        
Balance at end of period, issued (in shares)     141,969,666 101,969,666 89,182,001      
Balance at end of period, outstanding (in shares)     141,969,666 101,969,666 89,182,001      
Common Stock [Roll forward]                
Balance at beginning of period     $ 1,020 $ 892 $ 892      
Equity incentive plan issuance       1        
Common Shares Issued in Follow-on Offering, value     400 127        
Balance at end of period     $ 1,420 $ 1,020 $ 892