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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS One Westferry Circus In April 2018, the Company sold One Westferry Circus for a contract sales price of £108.6 million (approximately $153.5 million based on an exchange rate of $1.41 per GBP). The Company acquired the property in February 2013 for £82.0 million (approximately $124.6 million based on an exchange rate of $1.51 per GBP as of the transaction date). The purchaser is not affiliated with the Company or its affiliates. *****