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Retirement Plans	12 Months Ended
Retirement Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Company maintains a 401(k) Retirement Savings Plan for all employees that meet minimum employment criteria. The plan provides that the participants may defer eligible compensation subject to certain Internal Revenue Code maximum amounts. The Company makes matching contributions in amounts equal to 25.0% of the employee's contribution to the plan, up to a maximum of 4.0% of compensation. An additional matching contribution of 12.5%, subject to the same limit on compensation, may be made at the discretion of the Company, based upon the Company's performance. For the years ended December 31, 2017, 2016 and 2015, the Company's expense to the plan was $10.1 million, $8.2 million and $6.6 million, respectively.