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TOTAL EQUITY - Share Repurchase (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Repurchases of common stock            
Reduction of equity for retirement of repurchased shares $ 3,936 $ 1,756 $ 24,159 $ 5,312 $ 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 $ 2,700         $ 4,200
Share repurchase program 2019 | Common shares            
Repurchases of common stock            
Repurchased and retired shares 50         80
Weighted average market price of shares repurchased and retired (in dollars per share) $ 52.83         $ 52.48
Share repurchase program, period for repurchases     12 months      
Authorized share repurchase capacity remaining $ 45,800         $ 45,800
Share repurchase program 2019 | Common shares | Maximum            
Repurchases of common stock            
Repurchase authorization     $ 50,000