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Profit Sharing and 401(k) Plan	9 Months Ended
Profit Sharing and 401(k) Plan	Sep. 30, 2017
Profit Sharing and 401 (k) Plan [Abstract]
Profit Sharing and 401(k) Plan	Profit Sharing and 401(k) Plan Under our profit sharing and 401(k) plan, eligible employees may defer up to 50% of their compensation on a pre-tax basis, subject to Internal Revenue Service limitations. Each pay period, we may make a discretionary contribution equal to a percentage of the employee’s contribution. During the three months ended September 30, 2017 and October 1, 2016, our contributions, net of forfeitures, were $1.4 million and $1.1 million, respectively. During the nine months ended September 30, 2017 and October 1, 2016, our contributions, net of forfeitures, were $3.9 million and $3.4 million, respectively.