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TOTAL EQUITY - Share Repurchase (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Repurchases of common stock    
Reduction of equity for retirement of repurchased shares   $ 21,457
Share repurchase program 2017 | Common shares    
Repurchases of common stock    
Repurchased and retired shares 244  
Weighted average market price of shares repurchased and retired (in dollars per share) $ 46.77  
Reduction of equity for retirement of repurchased shares $ 11,400  
Share repurchase program 2018 | Common shares    
Repurchases of common stock    
Share repurchase program, period for repurchases 12 months  
Authorized share repurchase capacity remaining   $ 50,000
Share repurchase program 2018 | Common shares | Maximum    
Repurchases of common stock    
Repurchase authorization $ 50,000