COMMON STOCK Stockholders' Equity Note (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
March 2015 Common Stock Issuance
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues		4,002,000
Sale of Stock, Price Per Share		$ 50.73
Proceeds from Issuance of Common Stock		$ 202.9
Delaware Basin Acquisition [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Acquisitions	9,400,000