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Defined Contribution Plans	12 Months Ended
Defined Contribution Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Contribution Plans	Defined Contribution Plans The Company sponsors defined contribution plans covering employees who meet certain eligibility requirements. The Company makes contributions to the plans in accordance with terms specified in the plan agreement. The Company's contributions to the plans were $2,367, $1,857 and $1,157 in 2017, 2016 and 2015, respectively.