Dispositions and Real Estate Assets Held for Sale - Land Held for Sale (Details) - Carlsbad Oaks - Lot 7 [Member] $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($) a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of land | a	7.6
Dispositions sales price	$ 4.5
Gain (loss) on sale of properties		$ (0.2)
Properties held for sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of land | a		7.6
Dispositions sales price		$ 4.5