SHAREHOLDERS' EQUITY - Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SHAREHOLDERS' EQUITY
Cash dividends per common share paid (in dollars per share)	$ 0.365	$ 0.330	$ 0.300
Cash dividends per common share declared (in dollars per share)	$ 0.37	$ 0.345	$ 0.3