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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Savings Plan	EMPLOYEE SAVINGS PLAN We provide a 401(k) Plan to our employees by which they may defer compensation for income tax purposes under Section 401(k) of the Internal Revenue Code. Each employee may elect to defer a percentage of his or her salary up to a specified maximum. As of December 31, 2017 our 401(k) Plan provided, among other things, for a company contribution of 3% of each employee’s combined salary and certain other compensation for the plan year. Effective January 1, 2018, the company contribution increased to 4%. Salary deferred by employees and contributions by us to the 401(k) Plan are not taxable to employees until withdrawn from the 401(k) Plan and contributions are deductible by us when made. The amount of our company contribution for the 401(k) Plan was $2.9 million, $2.2 million and $1.7 million for 2017, 2016 and 2015, respectively.