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RELATED PARTY TRANSACTION	12 Months Ended
RELATED PARTY TRANSACTION	Dec. 31, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTION	RELATED PARTY TRANSACTION On December 28, 2016, we entered into a sublease for portions of our office space in Chicago, Illinois to Uptake, Inc. ("Uptake"), a Lightbank LLC ("Lightbank") portfolio company. Eric Lefkofsky, our Chairman of the Board, is a co-founder and owns a significant equity interest in Lightbank. The sublease was negotiated on an arm’s-length basis and is a market rate transaction on terms that we believe are no less favorable than would have been reached with an unrelated third party. The sublease extends through January 31, 2026 and the sublease rentals over that term total approximately $18.2 million. Pursuant to our related party transaction policy, our Audit Committee approved us entering into the sublease. For the years ended December 31, 2018 and 2017, we recognized $2.1 million and $1.9 million, in income from the sublease.