Retirement Plan	12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016, totaled $7.6 million, $7.9 million and $8.5 million, respectively, and is included in selling, general and administrative expenses and in operating expenses in the accompanying consolidated statements of comprehensive income (loss).

The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-URI http://asc.fasb.org/topic&trid=2197446

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-URI http://asc.fasb.org/topic&trid=2127225

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