SUBSEQUENT EVENTS - Narrative (Details) - $ / shares		12 Months Ended
	Feb. 03, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event
Common stock dividends, declared (in dollars per share)		$ 1.67	$ 1.60	$ 1.51
Subsequent Event [Member] | Dividend Declared [Member]
Subsequent Event
Common stock dividends, declared (in dollars per share)	$ 0.42
Subsequent Event [Member] | Dividend Declared [Member] | Series A Preferred Stock [Member]
Subsequent Event
Preferred stock dividends, declared (in dollars per share)	$ 0.4453125