Retirement Plan	12 Months Ended
Dec. 31, 2017
Postemployment Benefits [Abstract]
Retirement Plan	18. RETIREMENT PLAN The Company sponsors a defined contribution plan, under Section 401(k) of the Internal Revenue Code. The plan is a qualified automatic contributions arrangement, which automatically enrolls employees, once eligible, unless they opt out. The Company makes matching cash contributions subject to certain restrictions, structured as a 100% match on the first 1% contributed by the employee and a 50% match on the next 5% contributed by the employee. Employer matching contributions for the years ended December 31, 2017, 2016 and 2015, totaled $7,943, $8,495 and $7,696, respectively.

Retirement Plan

12 Months Ended

Dec. 31, 2017

18. RETIREMENT PLAN

The Company sponsors a defined contribution plan, under Section 401(k) of the Internal Revenue Code. The plan is a qualified automatic contributions arrangement, which automatically enrolls employees, once eligible, unless they opt out. The Company makes matching cash contributions subject to certain restrictions, structured as a 100% match on the first 1% contributed by the employee and a 50% match on the next 5% contributed by the employee. Employer matching contributions for the years ended December 31, 2017, 2016 and 2015, totaled $7,943, $8,495 and $7,696, respectively.