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Employment Benefits	12 Months Ended
	Dec. 31, 2019
Employment Benefits [Abstract]
Employment Benefits	8. Employment Benefits We have an employee 401(k) salary deferral plan, covering all employees. Employees could make contributions by withholding a percentage of their salary up to the IRS annual limit $19,000 and $25,000 in 2019 for employees under 50 years old and employees 50 years old or over, respectively. We made approximately $6.4 million, $5.7 million and $3.0 million in matching contributions for the years ended December 31, 2019, 2018 and 2017, respectively.

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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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