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Defined Contribution Plans	12 Months Ended
Defined Contribution Plans	Dec. 31, 2017
Defined Contribution Plans [Abstract]
Defined Contribution Plans	Defined Contribution Plans The Company sponsors a Retirement and Savings Plan which is a defined contribution plan pursuant to Section 401(k) of the Internal Revenue Code (the "401(k) Plans"). All full-time employees of the Company can contribute on a tax deferred basis to the 401(k) Plans up to federal contribution limits or up to 100% of their annual compensation, subject to certain limitations. The Company provides matching contributions for certain employees that are equal to a specified percentage of the eligible participant's contribution as defined by the 401(k) Plans. For the years ended December 31, 2017, 2016 and 2015, the Company's contributions to the Plans were $0.7 million, $0.5 million and $0.5 million, respectively.