EARNINGS PER SHARE - Basic and Dilutive Weighted Average Shares (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Basic weighted average shares (in shares)	70,251	68,354	68,287	68,246	68,219	68,190	68,176	73,078	68,789	69,409	83,927
Effect of dilutive employee stock-based compensation awards (in shares)									0	0	259
Diluted weighted averages shares (in shares)	70,251	68,569	68,362	68,300	68,219	68,315	68,303	73,373	68,789	69,409	84,186