SUBSEQUENT EVENTS (Details) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 03, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jul. 28, 2017
Subsequent Event [Line Items]
Common stock dividends declared (in dollars per share)		$ 0.33	$ 0.33	$ 0.66	$ 0.66
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in dollars per share)	$ 0.33
Revolving Credit Facility
Subsequent Event [Line Items]
Letters of credit outstanding, amount		$ 0		$ 0
Revolving Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Letters of credit outstanding, amount						$ 60,000,000