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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 17, 2017, we extended one of our two $1.25 billion unsecured revolving credit facilities from November 2019 to January 2022 with two six-month extension options. The interest rate on the extended facility was lowered from LIBOR plus 1.05% to LIBOR plus 1.00%. The facility fee remains at 20 basis points. The interest rate and facility fees are the same as our other $1.25 billion unsecured revolving credit facility, which matures in February 2021 with two six-month extension options.