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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent events Subsequent to December 31, 2017, we terminated our lease agreement with respect to a portion of our office space in New York. In connection with the termination, we expect to record a net charge of approximately $3.2 million in the quarter ending March 31, 2018 including a surrender fee of approximately $2.6 million. The net charge will include the surrender fee and approximately $4.0 million related to the impairment of leasehold improvements and other fixed assets in the surrendered space, which will be partially offset by other deferred credits.