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Business Developments	6 Months Ended
Business Developments	Jun. 30, 2017
Leases [Abstract]
Business Developments	13. Business Developments During the second quarter of 2017, the Company entered into an industrial gross lease agreement to provide approximately 287,016 square feet of its office space in San Francisco, California to a tenant beginning in March 2018 until February 2027. The agreement provides for total rental payments to be received by the Company of $167.7 million over the term of the lease, with the Company providing tenant improvement allowances of $55.2 million. In connection with executing the lease agreement, the Company accrued deferred lease origination costs of $6.5 million.