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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2018
Compensation Related Costs [Abstract]
Employee Benefit Plan	Employee Benefit Plan The Company has established a savings plan for its employees that is designed to be qualified under Section 401(k) of the Internal Revenue Code. Eligible employees are permitted to contribute to this plan through payroll deductions within statutory and plan limits. The Company contributed approximately $16.7 million, $15.6 million and $13.7 million of cash to the savings plan for the years ended December 31, 2018, 2017 and 2016, respectively, under a matching program.