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TOTAL EQUITY - Share Repurchase (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Repurchases of common stock        
Reduction of equity for retirement of repurchased shares $ 1,756 $ 24,159 $ 57 $ 21,400
Share repurchase program 2018        
Repurchases of common stock        
Reduction of equity for retirement of repurchased shares   $ 2,400    
Share repurchase program 2018 | Common shares        
Repurchases of common stock        
Repurchased and retired shares   55    
Weighted average market price of shares repurchased and retired (in dollars per share)   $ 42.79    
Share repurchase program 2019        
Repurchases of common stock        
Reduction of equity for retirement of repurchased shares $ 1,500      
Share repurchase program 2019 | Common shares        
Repurchases of common stock        
Repurchased and retired shares 30      
Weighted average market price of shares repurchased and retired (in dollars per share) $ 51.88      
Share repurchase program, period for repurchases   12 months    
Authorized share repurchase capacity remaining $ 48,500      
Share repurchase program 2019 | Common shares | Maximum        
Repurchases of common stock        
Repurchase authorization   $ 50,000