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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Defined Contribution Plan [Abstract]
Defined Contribution Plan	17.DEFINED CONTRIBUTION PLAN The Company has a defined contribution profit sharing plan under Section 401(k) of the Internal Revenue Code that provides for voluntary employee contributions up to the limitations set forth in Section 402(g) of the Internal Revenue Code. Employees have the opportunity to participate following completion of three months of employment and must be 21 years of age. Employer matching begins immediately upon the employee’s participation in the plan. The Company makes a discretionary matching contribution of 75% of an employee’s contributions up to a maximum of $4,000 annually. Company matching contributions were approximately $2.0 million, $2.0 million and $2.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.