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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 06, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Payments of Ordinary Dividends [Abstract]                        
Dividends paid on common stock (in dollars per share)   $ 0.32 $ 0.3 $ 0.3 $ 0.28 $ 0.3 $ 0.28 $ 0.28 $ 0.25 $ 1.20 $ 1.11 $ 1.01
Net issuance of common stock (in shares) 2,185,000                     2,185,000
Price of shares issued (in dollars per share) $ 36.50                      
Value of stock issued during the period $ 200,100                     $ 75,992