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Defined Contribution Benefit Plan	12 Months Ended
Defined Contribution Benefit Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Contribution Benefit Plan	Defined Contribution Benefit Plan The Company has a 401(k) savings plan that covers substantially all of its employees. Employees may contribute up to 100 percent of their pre-tax salary, subject to IRS limitations. The Company matches up to 100 percent on the first 3 percent of contributions and 50 percent on the next 2 percent. The Company made contributions to the plan of $6.2 million, $5.1 million, and $4.6 million during the years ended December 31, 2017, 2016, and 2015, respectively.