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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2018
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan We have defined contribution retirement plan under Section 401(k) of the Internal Revenue Code for our U.S. employees which covers substantially all U.S. employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. We match 50% of our employee’s salary deferral contributions up to a 6% of the employee’s eligible compensation effective 2010. We contributed approximately $5.2 million, $4.3 million and $3.4 million to the 401(k) plan during the year ended December 31, 2018, 2017 and 2016, respectively. Israeli Funds Under the Israeli severance fund law, we are required to make payments to dismissed employees and employees leaving employment in certain circumstances. The funding requirement is calculated based on the salary of the employee multiplied by the number of years of employment as of the applicable balance sheet date. Our Israeli employees are entitled to one month’s salary for each year of employment, or a pro-rata portion thereof. We fund the liability through monthly deposits into funds, and the values of these contributions are recorded in other current assets in the Consolidated Balance Sheet. As of December 31, 2018 and 2017, the balance of the fund liability was approximately $3.3 million and $3.2 million, respectively.