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Transactions with Related Parties	12 Months Ended
Transactions with Related Parties	Dec. 31, 2018
Related Party Transactions [Abstract]
Transactions with Related Parties	Transactions with Related Parties We lease office space from Two North Riverside Plaza Joint Venture Limited Partnership, an entity affiliated with Samuel Zell, Chairman of our Board of Directors. Payments made in accordance with the lease agreement to this entity amounted to approximately $1.4 million for each of the years ended December 31, 2018, 2017 and 2016.