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Employee Benefits	12 Months Ended
	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefits	15. Employee Benefits The Company maintains a 401(k) plan for all eligible employees.  The Company’s operating results include expenses of approximately $14.3 million in 2018, $8.7 million in 2017 and $4.4 million in 2016 for the Company’s contributions to the plan.

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- References

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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