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401(k) Plan	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
401(k) Plan	401(k) Plan The Company has a 401(k) plan (the “401(k) Plan”) covering all eligible employees. The 401(k) Plan allows for a discretionary employer match. The Company incurred and expensed $2.9 million, $2.7 million, and $2.1 million for the years ended December 31, 2017, 2016 and 2015, respectively, in 401(k) Plan match contributions.

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- References

No definition available.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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