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Employee Benefits	6 Months Ended
Employee Benefits	Jun. 30, 2018
Retirement Benefits [Abstract]
Employee Benefits	Employee Benefits Defined-Benefit Pension Plans The Company has defined-benefit pension plans in several of its international locations. Benefits paid under these plans are based on years of service and level of employee compensation. The Company’s defined-benefit pension plans are accounted for in accordance with FASB ASC Topics 715 and 960. Net periodic pension expense was $0.9 million and $1.6 million for the three and six months ended June 30, 2018, respectively, and $0.8 million and $1.5 million for the three and six months ended June 30, 2017, respectively.