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CAPITAL STOCK - Share Repurchase Progam (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 35 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Feb. 08, 2018
Jul. 29, 2015
Share Repurchase Program [Line Items]            
Stock Repurchased and Retired During Period, Value   $ (7,681,000)        
Share Repurchase Program [Member] | Common Stock [Member]            
Share Repurchase Program [Line Items]            
Stock Repurchase Program Authorization Date       Jul. 29, 2015    
Stock Repurchased and Retired During Period, Shares 1,068,841   0 2,285,084    
Stock Repurchased and Retired During Period, Value $ 7,700,000     $ 18,500,000    
Weighted Average Share Repurchase Price $ 7.19     $ 8.11    
Share Repurchase Program [Member] | Maximum [Member] | Common Stock [Member]            
Share Repurchase Program [Line Items]            
Share Repurchase           2,000,000
Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased 4,237,738 4,237,738   4,237,738    
Program Increase [Member] | Maximum [Member] | Common Stock [Member]            
Share Repurchase Program [Line Items]            
Share Repurchase         4,522,822