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EMPLOYEE RETIREMENT PLAN	12 Months Ended
EMPLOYEE RETIREMENT PLAN	Dec. 31, 2017
Retirement Benefits [Abstract]
EMPLOYEE RETIREMENT PLAN	EMPLOYEE RETIREMENT PLAN We have a 401(k) defined contribution plan which permits participating employees to defer a portion of their compensation, subject to limitations established by the Internal Revenue Code. During the years ended December 31, 2017, 2016 and 2015, employees who completed three months of service and are 21 years of age or older are qualified to participate in the plan which matches 100% of the first 6% of each participant's contributions to the plan subject to IRS limits. Matching contributions vest immediately. Participant contributions also vest immediately. Our matching contribution totaled $4.1 million, $3.8 million and $3.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. We made no discretionary contributions to eligible participants for the years ended December 31, 2017, 2016 and 2015, respectively.