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CAPITAL STOCK - Share Repurchase Progam (Narrative) (Details) - USD ($)
2 Months Ended 12 Months Ended 41 Months Ended
Feb. 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Feb. 08, 2018
Jul. 29, 2015
Share Repurchase Program [Line Items]            
Stock Repurchased and Retired During Period, Value   $ (26,423,000)        
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 469,975 3,979,402 0 5,195,645    
Stock Repurchased and Retired During Period, Value $ 3,000,000 $ 26,400,000   $ 37,300,000    
Weighted Average Share Repurchase Price $ 6.43 $ 6.64   $ 7.17    
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 857,202 1,327,177   1,327,177    
Program Increase [Member] | Common Stock [Member]            
Share Repurchase Program [Line Items]            
Stock Repurchase Program Authorization Date       Feb. 08, 2018    
Program Increase [Member] | Maximum [Member] | Common Stock [Member]            
Share Repurchase Program [Line Items]            
Share Repurchase         4,522,822