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Restructuring and Severance	12 Months Ended
Restructuring and Severance	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring and Severance	Restructuring and Severance During the year ended December 31, 2017, the Company incurred $9.6 million in severance costs primarily related to staff reductions in connection with the Acquisition and the Company's outsourcing activities and $1.0 million in restructuring costs related to future lease obligations and leasehold improvement write-offs for vacated office space. During the year ended December 31, 2016, the Company incurred $3.9 million in severance costs related to staff reductions, primarily in business support areas, and $0.4 million in costs related to future lease obligations and leasehold improvement write-offs for vacated office space. Total unpaid severance and related charges as of December 31, 2017 was $5.6 million which the Company expects to pay over the next three years. The Company expects to incur additional severance costs in connection with the Acquisition of approximately $0.2 million related to one-time termination benefits that are being earned over a transition period.