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Defined-Contribution Savings Plan	12 Months Ended
Defined-Contribution Savings Plan	Dec. 31, 2017
Defined-Contribution Savings Plan.
Defined-Contribution Savings Plan	15. Defined-Contribution Savings Plan The Company sponsors an employee retirement plan (the “401(k) Plan”) that provides certain eligible employees of the Company an opportunity to accumulate funds for retirement. The Company provides matching contributions on a discretionary basis. During the years ended December 31, 2017, 2016 and 2015, the Company recognized expense of $1.5 million, $1.4 million and $1.3 million, respectively, for matching contributions to the 401(k) Plan.