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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions					12 Months Ended
	Feb. 22, 2018	Jan. 23, 2018	Jan. 12, 2018	Feb. 12, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 26, 2018
Class of Stock [Line Items]
Payments to acquire real estate					$ 17,653,000	$ 15,564,000	$ 18,855,000
Series C Preferred Stock
Class of Stock [Line Items]
Depository shares to cumulative redeemable preferred stock ratio					1.00%
Dividend rate on preferred stock					6.875%
Percentage of redeemable preferred stock				6.875%
Liquidation preference (in usd per share)				$ 25.00
Annual dividend on depositary shares (in usd per share)				$ 1.71875
Subsequent Event | Series D Preferred Stock
Class of Stock [Line Items]
Depositary shares issued (in shares)		3.0
Depository shares to cumulative redeemable preferred stock ratio		1.00%
Dividend rate on preferred stock		6.125%
Percentage of redeemable preferred stock		6.125%
Net proceeds from shares sold		$ 72,600,000
Liquidation preference (in usd per share)		$ 25.00
Annual dividend on depositary shares (in usd per share)		$ 1.53125
Subsequent Event | Series C Preferred Stock
Class of Stock [Line Items]
Depository shares to cumulative redeemable preferred stock ratio	1.00%
Liquidation preference (in usd per share)	$ 25.00
Stock redeemed during period (in shares)	3.0
Line of Credit | Term Facility | Subsequent Event
Class of Stock [Line Items]
Line of credit facility, maximum borrowing capacity								$ 75,000,000.0
Line of Credit | Revolving Credit Facility | Subsequent Event
Class of Stock [Line Items]
Line of credit facility, maximum borrowing capacity								$ 325,000,000.0
7316 Wisconsin Avenue | Subsequent Event
Class of Stock [Line Items]
Payments to acquire real estate			$ 35,500,000
Acquisition costs			700,000
Earnest money deposit			$ 3,500,000

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A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Carrying amount as of the balance sheet date of interest costs that were capitalized to properties under development during the land development and construction period of a project, and which are included in inventory.

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