SUBSEQUENT EVENT (Details) - $ / shares		3 Months Ended		9 Months Ended
	Oct. 21, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)		$ 0.40	$ 0.36	$ 2.43	$ 1.25
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.16
Special cash dividends declared (in dollars per share)	$ 0.18